I have noticed the Brits and riders in Europe (since it seems they keep a lot of older bikes on the road), are quite adept at mixing the good parts from various brands (usually all Japanese, or all British) to whatever bike they are building. Kawwy parts on Suzukis, or Yamaha parts on Hondas. Makes me wonder if they have some resources or knowledge we don't have. Like which steering head sets fit which bikes, swingarms, etc. I especially like modern suspensions grafted to older bikes, it just opens up a new world of cool old bike possibilities. It seems to be growing more here in the US with the popularity of cafe racers, bobbers, rat bikes, street fighters, etc.