A broken derailleur hanger mangled my wife's 7900 RD cage:(.

I'm looking for one of two options.
1. To straight up buy a compatible jockey pulley (Ultegra and Dura Ace seem to be interchangeable, but NOT 105 or below).

2. Buy a complete rear derailleur. As long as the rear cage is in great shape, I can use it!

Let me know how much you want including shipping to (near) Toronto.

thanks.