The Help parts line that you see in most parts stores sell studs with brass nuts that can be used on RA manifolds. 3/8 inch-16
Just a quick peek online says that Home Depot has the set for $6.90, other sources are as high as $40 for the same thing. The short studs in the kit are the ones I commonly use on Pontiacs.
Link:
https://www.homedepot.com/p/Exhaust-...3147/308375095
You can also just buy all thread, and cut it to length, the brass nuts make for easy disassembly if you ever need to take the pipe off again.
Hope that helps you........
