Finding replacement buttons for the xbox 360 wireless racing wheel

Hello, everyone.

Yesterday I was at my local thrift store, where I found an interesting-looking controller called the Xbox 360 wireless racing wheel.

When I had a proper look at the controller the next day, I realized that it was missing one of the turn-signal-like buttons that act as the shoulder bumpers for the peripheral.

I can hardly find anything on preparing these things, let alone a place where I can find replacement parts for it.

It appears to have been made by Microsoft themselves, back in the day, but I can hardly find anything on it.

I just tested it and it appears to otherwise be working fine

I hope that someone can help me fix it,

Thank you all for reading