I just pulled a set of bearings off my UT Record crank because they started making noise (non-drive side was full of crap), and after flushing them out I noticed that the retainer and balls sit about 1mm closer to the inside edge on both sides. This is the side with no seal. I'm pretty convinced that in reality these bearings are standard 37x25x7 bearings with one side ground down to 6mm and therefore requiring the seal removal on that side. Anyone know for sure? After successful replacement of my Hirth joint bolt washer, I'm considering trying to grind down a standard 7mm bearing 0.5mm on both sides so maybe I can keep both seals.