Exhaust manifold hardware- Can anyone suggest a source?

Hey MRGTX.

I recently completed a EQ Magnum head swap on my 318 powered 68 Coronet Wagon. I re-used the stock manifolds (temporarily - have Magnum manifolds standing by). For the 4 studs I used Dorman (5/16-18 x 5/16-24 – 1 3/4") part # 675-092.
For the bolts I went the Home Depot route for their grade 8 stuff. I measured each one and used either 5/16-18 1 1/2" or 1 1/4". Hope this helps,

Ernesto