WHERE ARE HO SCALE F-UNIT COUPLER COVERS?

Does anyone know of a detail parts company that manufactures HO scale coupler covers for Athearn Genesis F-units? I need to find one, as the road I model, the CB&Q, used them. If you own any Genesis F’s, you know that a coupler cover is included to add on, but I made the stupid mistake of trying to force it on-and it broke[:(][}:)]. Does Athearn or Highliners have one of these in their parts list? If you can offer any help, thanks.

Should be easy enough to make from .010 or .020 styrene. You have a sample at hand to use as a model.