I saw these on eBay. They look like they would fit fairly tight. What car would these have come off of?

http://www.ebay.com/itm/LS1-Swap-Sta...8#ht_500wt_927

 

Those look like stock '98-'99 LS1 F-body manifolds. They were stainless in those years, then in 2000 the design was updated and the material was switched to iron.

 

one of them looks like a truck manifold and the other is a 98-99 manifold.

 

Wouldn't they be from a 01 or 02. I don't see an EGR hookup and I thought that 98-99's manifolds came with EGR

 

Nope. '00+ looked different, and were iron.

The EGR connection point on the '98-'99 isn't molded into the manifold the same way that it was for '00 (and '01-'02, except those just had the provision with no hole drilled since they didn't use EGR).

In the link above, the manifold that looks like a big log is the passenger side manifold, and there is a tube that runs out from the main body of the "log"....that tube is for EGR. The AIR connection is on top of the #2 primary.

 

That top one is def a 98-99 fbody, i have a 98 and wish i had kept the manifolds from bc now i am looking for one to fit my 81 camaro l33 swap...doh