That was me. I got the sling swivel stuff from VTI, Numrich, and Midway USA (nobody had it all, each had some). The rear swivel is mounted to the stock, and you have to inlet it for the base plate of the swivel. Best to mount it flush, scribe the line of the outside, remove it, and inset within the line.
The front swivel is a b*tch. You have to drill and tap, but it has to be exact, or you end up in the magazine tube or bore. I have done it twice. Next time I think I'll take it to a gunsmith if I every need to do it again.