Alright! All those holes have been tapped. I started with the largest diameter (easiest) and worked through to the smallest (most difficult) in case the last one needed a drill, which it didn’t. The one in the photo above was the first one, which gave me mostly just rusty sludge and a little coil of por-15 that had dripped into the first few threads. The last one yielded the same rusty sludge plus a bunch of shiny silver metal. Now they are all clean, shiny, and the same size. I can’t find a difference I can’t blame on my micrometer being less than top shelf and my test bolt feels pretty much the same in all of them. I did the brake caliper and dust shield bolts, too, since I was in that mode already.