I bought a couple of adapters for my wiper arms that will enable you to mount standard size wipers. I replaced the 32" bus-truck wipers that came stock with 28" standard size wipers. Works just fine and I think I paid around $6-8 each.
Below are a couple of pics and there may be some other conversions if you do a search. I may have bought the adapters on Amazon or ebay.
Thor Forums
