I'd like to know as well,
I will need to put an extra stud on the next rifle I'm planning to buy. Come to think of it, Harris( the guys that make Bipods)
make a bunch of adapter studs. look for their #2, #2a or #2r.
All you would have to do is drill a hole where you want the stud then glue/epoxy/acraglass the base inplace and you are done.
http://www.gunaccessories.com/Harris/default.aspCajun