I'm looking for the studs at the flange connecting the y pipe to the manifold. Most comments I see state 3/8-16 is the thread size, but a few also state M10x1.5. Rock auto shows both. Which is it? My car is a 1990 5.7

Thanks!

 

It should be the 3/8". Rock Auto often lists stuff that isn't necessarily applicable to your selected vehicle. The metric studs would be for the V6.

 

Thanks. It's odd that there is no 3/8 Dorman option listed because I know they make them.