Corey,

Unfortunately it may be hard to find them. I got them off of an old stock that I had laying around. I'd bet there from the 60's if I had to guess. I think you can still find something like them if you look enough. I know most of the sling swivels out today are of the quick release kind and these are not they are mounted and stay mounted. The one for the rear has a wood screw end and the one for the front has a machined end.