Marcus, that is a Russian stock. Cyrillic letters and Russian proof mark on the right side. It is likely the reason the cost was high. Don't modify it to fit the Chicom would be my advice, find a Chinese stock.
Thanks, yes, I know it's Russian. I just couldn't tell if it was from an Izhevsk or Tula rifle, which has been clarified below.
The reason the cost was high is that I got it (and the Chinese stock) off Ebay, and for some reason all SKS stuff is either listed for high prices there or people bid it up into the stratosphere.
It doesn't need any modification for the Chinese rifle I am restoring, the rifle drops right into the stock and fits perfect. But since I also won the auction for the Chinese stock, I am using it for this restoration and am contemplating either keeping this stock in case a Bubbafied Russian rifle comes my way, or putting it up for sale for what I paid for it since I don't have an immediate use for it. I paid a lot for it, which will make it harder to re-sell and get my money back out of it, but I figure if someone needs it for a restoration project like the one I picked it up for, it is a nice stock, these are getting harder to find, and when you balance the value of a correctly restored rifle vs. the same rifle in some crap plastic stock, spending the money to do it right is justified.
I've been collecting SKS rifles since 1970 when I bought my first Vietnam bring-back from a neighbor who was in the 1st Cavalry Division, and have had a bunch of them over the years.
I had everything this restoration project needs in my parts stash a couple years ago, but sold off most of my SKS collection and figured I didn't need the parts any more, so I sold them all for a fraction of what it is costing me to locate and purchase them now.