Hi Tom,
Steve had the part number correct in a private email to me. It is 803601. The specs as you noted are here:
http://tinyurl.com/3nbcxlr
We still have to overcome the issue of "bolt hole diameter" as our studs are bigger. I had not looked up the price of the 365 - that is a shocking price. A number of the guys on the Prevost forum are reporting good service and better pricing from Double Coin tires. I need to check into that.
http://www.doublecoin-us.com/
Russ