For the shock mount on mine, I just cut a wedge nearly all the way through with an angle grinder, bent it closed, beveled the seam a little, and had at it with my MIG welder. I'm no great welder, but they've been on there for almost 2 years now with not a hint of trouble, running some nice firm Bilsteins.

I reused one mounting hole as is, bolted in place using that, and marked the other 3 holes. Then just drilled them by hand. One hole is slightly siamesed with the old hole, but it seemed to me to be acceptable, I bolted all four up with the original PV back plate mounting bolts, well cleaned with plenty of loctite. It really didn't take much time or effort.

I guess I got lucky with my junkyard parts, although the caliper dust shields looked a bit dry and cracked they've worked great so far, neither sticking or leaking. The rotors looked good and still are, I haven't even had to replace the pads yet. Those old Volvo rotors seemed to be able to go through pad set after pad set after pad set with little wear, I guess the rotors were hard and the pads were soft. Modern style is to use hard pads and soft(er) rotors, so you have to replace rotors nearly as often as pads.
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I'm JohnMc, and I approved this message.