I bought one through California Car Cover Co. Their standard Cobra shape (with two roll bars in my case) fits very well and covers down to about 2" off the ground so it covers my 18" rims. I purchased their Superweave material due to bulk and being able to use it outside if I have to. Have used it twice now where I have been caught out in a sudden rainstorm and the water just rolls off. Also used it to store the car indoors over the winter.
Julian