Maybe I wasn't using the right terms. The hat fits fine, there was a spacer for that. The upper spring perch inner diameter is what's too big. It looks like I've got a solution though. The perches that came with the coilovers can be machined out to fit the thrust washers/bearing. They're also much more substantial than the ones that came with the plates.

While I'm at it, what's the opinion on weld in vs bolt in plates? I got the bolt in because people have said that cutting a hole in the shock tower weakens it, but now I'm thinking that the welded plate would be better.