These are the studs used to mount the turbo to a threaded manifold when a 1/2" spacer is used. We use these studs with a 1/2" spacer in our twin turbo kits. These are longer than the stock studs. Price is each.

These studs are used to mount a turbo to a threaded manifold when a custom 1" spacer is used.

Price is each stud.