I bought moped tires and tubes about two years ago at
Donelson Cycles, Inc.
9851 St. Charles Rock Road
That was for a Tomos that I have since sold so I cannot look at the tire sizes. I don't remember the tire size so you had best call their parts department before going. They had the tires and tubes and the rubber strips you put over the ends of the spokes (to protect the tube) in stock at that time.