20V headers for an A1

I am putting together a motor to go into my A1.  I am using the 20V head from a turbo car.  I am trying to find a source for a good set of headers before I give up and fabricate my own set.  I am in the U.S.A., and we never got a normally aspirated motor with the 20V head, so I am trying to find out if anyone on your side of the pond is making any.

Thanks,

Matthew