NHSl550

Looking for a set of 20" wheels that will fit a Sl65.. Ugly, banged up, mismatched. junk, doesn't matter. Just something to store the car on for the winter. Must be able to hold air of course.
My tires have flat spots now and will use those tires. I could jack the car up but I'm afraid to screw up the ABC . If someone has recommendations on storing, LMK