Follow-Up:
I talked to a owner of another Rialta 1/2 yrs ago in a VW dealership and he mentioned that it is nearly impossible to get those tires for the Rialta. So, in fear, I ordered a set from Winnebego and waited couple of weeks.. now, I have a supply of a set of tire for my Rialta in case of rainy day. The tires are odd in size and very difficult to get. My suggestion.. get a set ordered now and let it sit in garage for future. Good luck!!!