Here is a link for a Tucker Rocky supplier that has several cover manufacturers. Also, here is a link to a Parts Unlimited supplier. Lastly, here is a very nice cover, spandex-like for a custom cover look. If you don't want to buy from them you can use it for info to further research it by MFG.
I park my Max at work in a open parking lot with no shade from the sun or seagulls so I'm going with a 1/2 cover. I may get a HD cloth one for storage for next winter as I just drape a couple of moving blankets over it for storage now.
I have a generic one with elastic that covers the tires, it has some vents too. Have to tilt up the mirrors for best fit, but keeps the dust off pretty good