Rear spring mount replacement

[zachste]

So I noticed I had some of the notorious "Chevy lean" going on so I started taking some measurements and digging deeper. This is when I found the upper spring mount looks to be pretty rusted on the rear driver side. The spring looks like it's pushed into the mount due to the rust. Is there anyone who makes a bolt in replacement of that mount/bracket? Would the tubular rear trailing arm kit that CPP sells work and replace that upper mount?
The 2nd and 3rd pictures are of the driver side rear spring mount/perch. The last picture is of the passenger side rear spring mount/perch.