[Yosemite Sam]

That one looks pretty worn out.

Someone (maybe Extreme motor works) makes a replacement "square hole".

The idea is that you cut off your old hole and weld the new one on.

Or you could just fab your own "missing part" and weld it back in, then take that other stuff off and put it back as it's supposed to be. This is what I would do, just because I'm such a cheap-skate.

Absolutely no need to spend a ton of money on such a little thing.