29 tooth speedo gear

Ah good question I dying know which one I need.
28 inch tire, 410 gears.
Any help appreciated.

I bought one a while back from someone that was blocked at the end tip and couldn't use it. I threw it away, told the guy so he doesn't have problems with anyone else but didn't think to keep it to know which one I need.
Lost out on both ends lol
Thanks... For any help.