These look a low quality rear derailleur..I gave you one solution..Here is another..Go to SJScycles website and order one of these..
https://www.sjscycles.co.uk/gear-spa...anger-bracket/
They have 2 other alternatives..
SJScycles will ship worldwide really quickly..They are a first class bicycle supply company..amongst the best in the world..This component will just cost a few dollars..and then you can go to your local bike shop and choose any good quality short cage derailleur you want.It will simply bolt onto this component..
The chances are if you go to a decent local bike shop they will have this type of thing in stock anyway..
Once you have this shimano gear hanger you can fit any one of a hundred rear derailleurs on the market..It's a NO Brainer!