I bought one from AA-OK just after they raised their prices. I believe I got charged $15 for one. If I remember correctly RPB sold regular rear swivels for AK wooden buttstocks cheaply. The swivel assembly is composed of three pieces: the swivel loop, a bottom plate and a top plate.
The top and bottom plates have two screw holes in them and are spot welded together. You can use a Dremel and a chisel to separate the two plates. Typically you cut through the bottom plate and lever the pieces off the top plate.
That top plate becomes the 'ears' of the swivel.
You can bend the plate in two keeping the swivel positioned surrounded by a little loop in the plate. You can then insert it and bend the ears flat.
I have not yet cut the slot in the -65 receiver and tried to attach the swivel ears. They may be beefy enough not to need spot welding --- maybe.
One advantage is the swivel loop looks correct for the -65, not like the Chinese variant.