maybe try corwin arms.
Don't see it on their site. When I sold my folding stock a few years ago, I sold the bolt with it. I didn't like shooting with my folding stock, found it uncomfortable... did the OP shoot with one before? Solid buttstock is way better in my opinion.
I found a European site charging 5 pounds for it.
h--p://www.vz58rifle.com/products/folding-stock-screw-hex-key-/




























