Does anyone know the bolt sizes for installing High Flow Cats? I bought used aftermarket ones that did not include the bolts. They should have these at Home Depot right?
Also, the gaskets look like they are in good shape, anyone have any issues using there original ones?

 

Crawford Z was kind enough to provide me with the proper sizes for bolting aftermarket HFC.

6 x 10mm, 1.25 thread pitch, 40mm long
(brackets) 2 x 10mm, 1.25 thread pitch, 25 mm long

You can also use your original gaskets.