How to find a replacement/equivalent rectifier diode?

A few tenths of a volt, but it does add up to more power losses. If the amp is class AB with a decent heat sink you won’t notice. If it’s class D and doesn’t have any heat sink to speak of those few extra watts might matter.
 
Its a class D, but it does have a pretty beefy heatsink. I will probably keep running the one with broken legs for now (soldered an old component leg to it) and try to find an even better replacement. I may get the ones I purposed earlier and just test also idk ha.

I did see some of the "exact" ones on ebay, but I dont trust em. They might be legit cause they are kind of spendy, but Iv bought a electrical part on ebay before, and it immediately blew up on testing. (Thats why I was so worried about making sure to get a proper replacement ha)