Looking at the tci flexplates on byunspeed and I see there are two, one for a small bolt pattern and a wide bolt pattern. What's the difference? Could anyone tell me if the part# is the same for a truck flexplate, I can't get a hold of stores right now because of the time.
This is for my z28.

 

im going with the one from yank sfi rated and only like 75 bucks

 

This is courtesy of Chris at Circle D converters: