In the 3-6-9 navis the gen dial is slightly bigger and must be ground down about a mm or so to fit in the case. Once in, the datewheel opening is too large, thus you will see the outer edge of the datewheel showing through. Search for Takashi's post, as he has pics of his transplant posted. IMO, I would stick with the rep dial as it is pretty decent, and the date window looks terrible looks bad with the gen dial. Get a 6-9-12 version if you want to do a dial swap, as it drops right in.