The company that I work for has partnered with an enthusiast to get parts reproduced. C8OE-B & C9ZE-E - 7 blade radiator cooling fans, 1968 console radio knobs, and 1967 and 1968 air conditioning vents are among some of the parts that fit Mustang.
The fans were fairly easy to commission, we were able to bundle them together for the manufacturing minimum order commitment. They share the same blades, and the centers are the same except for the fan clutch bolt pattern size. The part number stampings are secondary on the blades.
The 1967 and 1968 A/C vents did not pencil out, but were done anyways. Tooling for correct break away vent registers on the 1968's would have really run up the cost. Our partner wanted them for Cougars, and was able to modify the passenger side one for Mustangs. Plus for Mustang they needed wood grain or black pebble grain decals.