You can buy normal bolt snaps, and tie them on with braided nylon line (cave line). Be aware that the SS bolt snaps you buy at hardware stores often don't have a stainless steel spring in them, so they will eventually rust. You can slow the process by making sure they're soaked free of salt whenever they're used, and by applying WD-40 to them. Or you can solve the issue by buying the more expensive marine hardware that has SS springs in it. I buy mine at my LDS, because I'm too lazy to put together an order to get them on line.