Source for engine hardware?

Most fasteners on Mopars are not grade 8, and if they are, they are special bolts, like clutch, flywheel, converter bolts and head bolts. Rods and main bolts also. But most of the external stuff even though not "appearance" correct could be common grade 5 bolts. Intake, water pump/ timing, bell housing/ starter, valve covers and exhaust.

There are a few aftermarket suppliers including MP that supply some of the special fasteners.