there is no doubt in my former military mind, that there warehouses full of those stock sets........the problem is that, like everything else, getting a export licence to get them here.
from my understanding there was a treaty, or somekind of agreement the russian signed in order to keep getting their welfare payments from us, that they can't export certain things into this country...maybe AK furniture or gun parts is one of them.
however, if you have your heart set on obtaining genuine soviet stock sets, there is a guy on e-bay (andyarts), and I believe he slso sells on one of the gun auction boards, that you can buy those stock sets, I hadn't seen the 74 ones, with the cutout on the stock, and the straight cut lower handguard, just the AKM ones..........but be prepared to pay some big money for them....and have a long wait.
I bought a SVD stock set from him, it took about 2 or 3 months to get to me, what with russian customs...but I did get it, brand spankin' new and beautiful.