Hy JRMunn, I see what you mean about availability, I did a bit of searching. The O.E.M. p/n 5467823 that equated to Wagner FE56462 which appears to be no longer available, but it did tell me that the brake side cylinder bore was 1 1/4" and the clutch cylinder bore was 1 1/8". The Raybestos catalog had no listing for your application, however some detective work led me to their p/n MC36347 which is listed as the master/clutch cylinder for a 1968 T50 and it is the same O.E.M. p/n (5467823) as the master/clutch cylinder for your truck. Napa crosses the Raybestos p/n to their p/n NMC P55385 $55.99 plus a $33.00 core, hope that helps and Merry Christmas.
