Are you sure the caliper spacing is 50mm? That would be very unusual. 40mm is more likley, and I believe somebody makes an adapter for the later 65mm caliper, though I couldn't say who right off the top of my head. As for the triples, I would say go for the cyclecat top clamp. Beyond georgeous. Although a lot of people have had success with having their top clamp milled out, and that costs about 1/10 as much. Dont even bother with the marzoccis.