I have indeed listed all of the parts of the chopped Sporter, both on EBay and Gunbroker.
The trigger group has sold, but everything else is still up for awhile, at least. I am selling a sweet NR, and have listed the "mystery" M as a "one of a kind", more to get it out in the public eye and check interest, but it IS for sale or trade, unofficially. I would trade it for a nice D and cash on your end, but no crazy amount. I want both parties in a trade get what they want, and keep it in the SKS family. Might be interested in other trades, so ask away! Worst I can say is no, but then I'll say, "What can you counter?
Check EBay under SKS gun parts, and SKS rifle parts for the stock and other components, the bolt and carrier as a unit, the barrel stub and cleaning rod. All under my lkermit3749 user name.
Gunbroker has the NR and the mystery M, under the screen name LKermit.
I wish I had seen your post much sooner, but there is still several hours on the NR, and up to two or three days on the rest.
I would love to work with you to get what you need, so if you like you can text me at 405-519-3352. Also on Facebook Larry Gilmore, Yukon, Oklahoma. Facebook Instant Messenger.
I can send pics as well, so let me know f I can help. I can do PayPal and USPS money orders.