i have a 96' camaro lt1 what kind of 02 extensiions do i need for my Lt's install the square connector or the flat connector

 

The front O2's are the flat connector, the rear O2's are the square. If you're eliminating the cats, all you need are 2 flat extensions.

 

how long 12" ,24" ,36"

 

I did some searching and a lot of people seem to do ok with 12", while a few needed 24". I just played it safe and went with 24" for my front O2's.

 

get 24'' if your unsure.

 

I got away with using the 12" extensions with the Pacesetter long tubes. I have heard of variances between what works for who. If you feel comfortable using the 24"ers, then go for it. Just secure them neatly with some cable ties so the extra slack isn't dangling all over.