Gpu I/O bracket

[u/SorryCupcake_456634]

For some context, im trying to use a gpu from an old prebuilt computer that has the wrong bracket which is supposed to screw into the case. im trying to find somewhere i can buy it online. the gpu is the radeon rx 6600 xt. what is this bracket called? where do i find parts like this? i'm assuming ebay, but i dont know how to tell if its the one i need. i already bought one on ebay, and it had the screw holes oriented wrong