340 Exhaust Manifold Bolts

I bought a set of 340 71-73 exhaust manifolds but now can't find the bolts needed to mount it, any info would help. Also when I took of the headers the front and rear bolts on both sides leaked coolant, is that normal? Hope so. The engine is a 72 318 Dodge Dart Swinger. I tried local auto parts store and even rock auto, no luck.