I have a '68 650. The handlebar p-bolt clamps are pretty shabby and want to upgrade them. Does anyone know what other clamps or yokes will fit. I'm not a purist and actually would prefer alloy or stainless. I see some Yamahas that look subtle, but hate to invest without knowing that they...or others... would fit/could be modified to fit. Best of all would be the much later Triumph scripted yoke.