WTB:71 340 ex manifolds, A body

I'm looking for a nice set of 340 exhaust manifolds for my 71 Duster 340.

Casting #'s
Dr/ L side 2863553
Pass/ R side 3418623

Willing to buy just the passenger side manifold too.
Mid 1970 casting dates preferred. Pm or reply here with price.

Thanks!