The original stem was labeled 0.833 (21.1mm), however it will measure slightly less. Any other same sized stem should work. The original handlebars were 25.4mm center and 23.8mm where the brake levers would mount. This is the standard size for road bike brake handlebars/levers at the time.
Last edited by Metacortex; 09-20-14 at 12:36 AM.