On the pictures you can see that where the bit sits, the back screw is missing. These are just regular steel screws that can be picked up at a tack shop. I bought new ones for it and I promptly lost them again.
Also for sale or trade are a brand new, never used set of turquoise spur straps with pinkish-purple rhinestones. No brand names on them, but they are well made.
Both items ship flat rate priority anywhere in the US