Where can you find parts for revelation r125b?

Just have to be lucky I guess. I spent 20 years looking for a clip for mine, and finally just today I found one at a gun show. I don't know if this applies to every other part of this gun, but I finally found a clip that is compatable and it is a Mossberg 350. At least that is what it was tagged as. I think thats just the series though. The exact model number in the book said Mossberg 353 will work, so I'm not sure if the tag was wrong or what. Anyway, Hope this helps somebody out.