If your old belts are shot, these O-rings from McMaster-Carr are the perfect replacement.
via https://old.reddit.com/r/typewriters/comments/1ucvk38/i_pulled_my_old_smith_corona_put_of_the_attic/ <br /> u/pete1885 reports good success with o-rings from McMaster-Carr
Specs: 9452K191 3 3/4 ID; 4" OD; 70A durometer; black
