Doug (Tantal) made an excellent post years ago about how TsNIITochMash designed plum furniture and sent it to Tula/Izhmash for testing. I'd recommend searching for it if you are interested. Tula never put it into production. KVAR made clones of them for awhile but I don't think they still do.
Originals (from Russia) were not in a great number. But a Russian Mililtaria dealer (kind of guy that sells stock sets, deacts, etc) did tell me that Tula did put some AKS74U deacts out with the ribbed plum handguards...
So in theory, one of those could have made it to the USA.
I just found a plum AKSU set that I had purchased from Kvar for my Tula build a couple of years ago. I decided to use the original wood handguards for the Tula. I decided to use the Plum set with pistol grip for an AKSU in 5.56 instead. It isn't finished yet, but I will post some pics when complete.