Exhaust manifold 28-29?

[GWR]

I am trying to help this fellow find an exhaust manifold for his car. I know the part number for the 28 is different, propably for the Maxwell engine.
I have the ones for the 30U that dump out the front, but he needs one that dumps out in the rear. He actually needs both intake and exhaust, but I think my intakes will work with the 29 exhaust.

Any help or guidance would be appreciated.

Happy Motoring, Gary