So, the guy that built my donor car did some janky stuff. Like using stacks of washers to make up for missing threads on exhaust manifold studs.

Im running a flying Miata turbo manifold from the mid 2000s.

What should I order for studs/nuts/washers? Anything special? This is specifically for manifold to head. The turbo has all the goodies locking hardware and stuff already sitting on the bench. Flyin miata had a kit for that!