R1 Exhaust manifold

[ha_ho_lets_go-7]

Where is the best place to get a R1 exhaust manifold for a standard
front mounted installation?

The car I'm putting it in, is a complete 1 off, so there isn't a off
the the shelf manifold for it.

I was thinking of trying a Phoenix or Locost type manifold?
Any one any thought on this?

Or does any one have a second hand one they wish to sell??