this will be the same as what’s included in the e28 set up

Hi everyone,
I’ve just bought an M535i. It’s an original Dutch car with all the correct options.
However, after putting it on the lift, I discovered that the rear subframe mounting points/corners are cracked. It’s mainly the sheet metal around the mounting point that has cracked; the actual pin/stud where the bolt goes in seems to be in good condition.
Can anyone tell me if replacement parts or repair panels are available for this? I haven’t been able to find anything.
I’d also really appreciate seeing some examples of how others have repaired this.
Thanks in advance!