We just recieved a pair of Alcoa 22.5 hub covers in kit form, part #109176A from an E-Bayer for $37.95 plus shipping. This includes two covers with knob attatchments, 16 nut covers, and 2 brackets. They fit the 8 hole 235 mm bolt circle, 221.1 hub bore. Newmar quoted us about $400. for 1 cover with 1 knob attatchment. The E-bayer had 40 sets with bidding starting at $19.95.