I was planning to pick up a rear trunion from interordnance. Got 2 underfolders and I think I will make one of them a fixed wood stock typer. You can also get a new US made stock set at Aim. They are walnut and unfinished. Pretty good deal for $50. If all you want is the rear stock I would buy the rest of the parts from you.
http://www.aimsurplus.com/acatalog/Rifle_Stock_Sets.html
http://www.aimsurplus.com/acatalog/Rifle_Stock_Sets.html