Offenhauser equa-flow manifolds for the 1965 273 engine

Does anyone know who would sell Offenhauser manifolds for the 1965 273 engine?
The very old Offenhauser catalogue lists the dual port, but I am more interested in the 360 equa-flow manifolds, either the high rise, 5699 or the low rise, 5489.

Does Offenhauser even cast them anymore?