Yes, they are definitely 6SN7s, there are usually some on ebay although the seller russhamma seems to be offline... he had the right ones. Some others probably do to, idk.
The ones I have are metal base black plate, but they lack the holes in the plates. They sound excellent. I have some really nice 6SN7s and 5692s and the Russians are up there. I do not have any crazy high $ tubes though.