Dave:
I bought a California Car cover back in 2001 and it is still great today.
I is their Noah material cover.
800.423.5525 or online
Cal Cover, Inc.
Since I have (2) rollbars I had them make some modifications to their Cobra cover.
They even sent a diagragm where I out in dimensions of my car.
Very satisfied.
I also bought their Custom Fit Interior Cover for when I want to cover up the interior.
I have used it in the rain and it worked well.
The one I bought was for a Miata.There is a lot of different ones out there.
Do a seach on Club Cobra for car covers.
You will find a lot of people will recommend California Covers.
Price will be under $200.
Jim