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?
Contact them. They come up for sale here every now and then. You can start a want ad. Look for the Edelbrock D4B for the 64-65 273 heads.