Are you talking the double hook and loop on the sling?
Try a saddlery.
Yes, I suppose I should've been more specific, huh? So far I've checked all the online sources for leather hardware and I'm coming up empty, so now I guess I'll call around.
You'd think that Tandy Leather would have it if anyone would, but noooooo...
James
Uncle Mike's makes a sling just like that only with brass hooks. Could you take one of those, make a pattern, and cut your own out of sheet steel?
I've got some scraps of free-machining brass (leaded) 1/16" thick. Its very easy to work with, bend and cut. I've cut it with a wood cutting blade on a bandsaw.
Let me know if I can be of assistance.