I just installed the cover that Iordered from Overton's. It was a bit tricky to figure out with no instructions in the box. The cover cost $480 including shipping and taxes. Not bad!The qualityof the fabric is ok, not the really heavy materia but it does have a 5yr warranty so it can't be all that bad andthe price is awesome! The one that I ordered was the 21.5' - 22.5' and it fits nicely. The part number is 74877.
http://www.overtons.com/modperl/prod..._Cover_216_225