What are the differences between the H4351 and H4703 headlights?
What are the differences between the H4351 and H4703 headlights? The H4351 is from the early 4th gen f-bodies 93-97 and the H4703 is from the later 4th gens. Are they the same dimensions and the difference is in the plug? I had thought all 4th gen square headlights were the same.
Copy & Paste Moderator
Joined: Apr 2002
Posts: 9,764
Likes: 208
From: Eastern MA
They are different sizes and have different connectors. They are not interchangeable.
Are you trying to fit 1993-1997 Camaro headlights on a 1998-2002 Firebird or vice-versa?
Which car are you trying to install headlights? If you want for the 1998-2002 Firebird, you can get LMC Truck housings and use upgraded bulbs in them. There are threads on this.
Are you trying to fit 1993-1997 Camaro headlights on a 1998-2002 Firebird or vice-versa?
Which car are you trying to install headlights? If you want for the 1998-2002 Firebird, you can get LMC Truck housings and use upgraded bulbs in them. There are threads on this.
Yeah, I thought so. I had seen some sealed headlight conversions on DDM Tuning for the older style and wondered if they would work. I have the LMC's and was just curious.
Copy & Paste Moderator
Joined: Apr 2002
Posts: 9,764
Likes: 208
From: Eastern MA
4x6 is larger than the H4701/H4703 that the 1998-2202 Firebird uses.
EDIT: I just saw that they do have a LED version now of H4701/H4703, but I don't see output shots and don't know how they compare to other options. Some of the pics show 4x6 though which is wrong. The description also says that this fits both, which is also wrong since you need separate low beam and high beam patterns. The description also says that it has H7 connectors. However, they have a video showing these installed. The video shows the output. They basically install the same light in both spots and aim the high beam higher. Also, these have a fog beam pattern without a central hotspot. That may be passable for a low beam in city driving, that's not good enough for a high beam on the highway or rural roads. Although these are better than the original sealed beams, I'd like to see these compared to the LMC truck housings with upgraded bulbs or drop-in LED. Anyone want to try a comparison?
EDIT: I just saw that they do have a LED version now of H4701/H4703, but I don't see output shots and don't know how they compare to other options. Some of the pics show 4x6 though which is wrong. The description also says that this fits both, which is also wrong since you need separate low beam and high beam patterns. The description also says that it has H7 connectors. However, they have a video showing these installed. The video shows the output. They basically install the same light in both spots and aim the high beam higher. Also, these have a fog beam pattern without a central hotspot. That may be passable for a low beam in city driving, that's not good enough for a high beam on the highway or rural roads. Although these are better than the original sealed beams, I'd like to see these compared to the LMC truck housings with upgraded bulbs or drop-in LED. Anyone want to try a comparison?
Last edited by VIP1; Jun 18, 2021 at 02:43 PM.
I can tell you the LMC housings with led work pretty well. I used cheap ebay LEDs. The high beams light up the road well. I haven't been flashed by a car going the opposite direction.
So did those LMC housings just use a H11 halogen originally, if so I just need a H11 size led, correct?
Trending Topics
Copy & Paste Moderator
Joined: Apr 2002
Posts: 9,764
Likes: 208
From: Eastern MA
The LMC Housings use 9005/9006 bulbs. You can fit 9011/9012 bulbs (they fit in the housing but the headlight bucket on the car needs to be trimmed since 9011/9012 bulbs are right angle). Alternatively, you can install 9005/9006 LED.
9011/9012 bulbs are designed to replace 9005/9006 bulbs. They fit some headlights on different cars without modification. On some, small trimming to a tab on the bulb lets them fit in. They fit on my mother's 2015 CR-V without any trimming.
Low Beam: 9006 (or 9012)
High Beam: 9005 (or 9011)
I have the LMC Truck High Beam housings with LED (I have HID Projectors for Low Beam).
Spacing is tight behind the headlights so make sure not to get LED bulbs that are too deep or too wide.
9011/9012 bulbs are designed to replace 9005/9006 bulbs. They fit some headlights on different cars without modification. On some, small trimming to a tab on the bulb lets them fit in. They fit on my mother's 2015 CR-V without any trimming.
Low Beam: 9006 (or 9012)
High Beam: 9005 (or 9011)
I have the LMC Truck High Beam housings with LED (I have HID Projectors for Low Beam).
Spacing is tight behind the headlights so make sure not to get LED bulbs that are too deep or too wide.
Last edited by VIP1; Feb 2, 2022 at 10:54 AM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Thanks Vip1, I bought an extra set of 4 hl buckets just to do this LED mod, I might drive my car at night maybe 6 times a year at the most but on those times I am mostly on back roads coming home in the country and any extra light I can get to avoid a deer crossing the road helps!
12 Second Club
Joined: Mar 2005
Posts: 378
Likes: 1
From: Austin, TX
Would like to thank wannafbody for mentioning Genssi. Searched them and ordered 2 kits (4 lights). Would also like to echo VIP1's observations. Can confirm they are far superior to original sealed beams. Can confirm they are more of a flood pattern and stuff. Very nice cutoff though that spreads wide. If a better low beam is possible I would love to see it. High beams, as mentioned, are the same as low. There is a decently noticeable difference with double the number of lights. They do not throw super super far. I must reiterate they are far superior to the factory trans-am headlights in my application. I drive at night and in early morning where deer and other things are plentiful. No one has flashed. Install was not complicated at all. I did cut the factory vehicle side off and crimped regular insulated female wire ends on them to plug into the 'H4' or whatever male ends came with the LEDs. These outshine the sealed halogen low and highbeams any day. Happy with my purchase considering it's a nearly drop in replacement. Will consider something that throws a little further on high. Then again I already feel spoiled. It's weird being able to see the road and stuff. I don't post often but that's my take away even though it's a little off topic in case anyone sees this. 345k miles and have had the car since 2005 or so.