You can get a bunch of straps everywhere. You can even request a free Turnigy strap from HobbyKing; you place any order, you check out, and immediately contact chat and ask them kindly. They'll add a note to your order and you might get a free strap.
Be warned that HobbyKing chat is offline these days.
I think it's just a kind of screw. At least on my JR XP652 it's a metallic (or chromed plastic) screw that you can take out. If you don't care about the look, you can get a ring soldered to a fitting bolt.