[Ross F-1]

What kind of tires are you going to run? If you want to run tubeless radials, I'd go with new wheels. The originals were riveted and don't have some safety features that new wheels have, that are pretty important for running tubeless.

16's were the most common stock wheel as Rotorwrench noted, and narrow. About the widest modern tire you can run is a 195 or possibly a 205.