Thanks guys for the suggestions. I went into a small local hardware store today and asked a gentleman working there if they had any metal rings. He looked at me like I was crazy, but I was actually able to find one JUST like the TM ones for a whopping $1.28 after CA tax. They had D rings too.
Oh, and since this is the kanayama thread, here is a little eye candy from this morning:
Oh, and since this is the kanayama thread, here is a little eye candy from this morning: