It wasn't N Scale of Nevada, was it? Cast metal parts? If so, I'd say you're probably out of luck, as they're long out of business.
If it wasn't them, I'd also be curious as to who else makes/made them.
If you want to make your own, it isn't hard to do. Styrene strips, and plastic brake parts for Precision Scale, unless THEY'VE quit making them. They were still available the last time I looked, late last year. That's what most of mine are, mostly because I started body mounting 1025 couplers in the early 1980s.