Hi Bob. I bought ours at CW.
RV Tire Covers, Wheel Covers - Camping World
Heavy-duty flannel-backed vinyl reflects heat and light and repels liquids. To determine correct size, measure tire diameter from tread edge to tread edge, across center of wheel cover. NOTE: All 19.5" wheels require #21648. Add 1"-2" to diameter for protruding wheel covers. Price is for a pair.
We bought oversize for our 5er and they fit the 19.5s on the Precept.
I think it is a good investment.....<$25. a pair. Sun and ultraviolet rays are damaging. I put them on even if I am only staying a week. Easy to put on and remove. I don't tie the stretch cord behind the tires, but one time a strong wind partially removed one cover.
Amazon also has them listed.
Darrell