Have you tried your local gun store?
I just bought one for my TC Contender...same intention as yours to mount a bi-pod. There were several packages of "studs" at the local gun shop, and this is in a town of less than 3000 people. The one I purchased has a stud length of about .85 inches, so I will have to grind down to make it fit my contender.
Unfortunately I threw away the package it came in, so can't say for sure what the manufacturer is. My guess is an Uncle Mikes.
Good luck in your search.
Silvertp