Most Truck Tire Dealers can get them. The 8.25 inch wheeel is cheaper than the 7.5 as it is used by most trucks but usually in a 10 bolt pattern be sure of the number of lug nuts.

Six Robblees in Tacoma at 253-272-8412 sells Alcoa wheels. There was a store in Seattle at one time also. Marty

I think that Les Schwab truck tire centers carry the wheels to fit your coach. All of the information that you will need for a replacement wheel is stamped in your wheel. The wheel diameter, wheel width, and manufacture's name and model number will be stamped in the concave side of the wheel. So look at the outer rear wheel to find the information. It is usually about 1 to 2 inches from the edge.

Double check you lug nut count. Your coach should have 10 lug wheels, and I think that most of the 1998 models used Accuride wheels instead of Alcoa.

Gerald  

Your closest Les Schwab, Dave, is in Lynden, WA.  (360) 354-1446.