Well Akko and guys, I had the same problem on one missing snap. I also was desperately searching for a spare snap, but unfortunately didn´t find one until today. Finally I found a nice substitute - a bit expensive, but as I think a nice alternative:
The ebay store SUZY'S SURPLUS is selling an item "US 45 PISTOL LANYARD UNDATED EACH E4209"www.ebay.com/itm/US-45-PISTOL-LANYARD-U ... 484169830a
The hook at these lanyards doesn´t have an open ring and it is a bit tricky to assemble it to the pouch, but it is worth it.
Allthough I hate to destroy old stuff, I cut the line off and used it to do a repair job on my backpack.
Just 2 flies with one struck.