I just measured the P-50's on my 650b, Hetre'd Quickbeam and they're around 53-55mm, so I think you are correct in assuming that you have P45's. My experience has been that the P-50's gave better coverage and fender line than the 45's but that may have been a quirk of installation...
Quick pic of the Quick(beam) for fender displayin' purposes: http://www.flickr.com/photos/40738390@N08/4317180490/in/photostream/ -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/nVZt4ZzRFukJ. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.