Keep a watch on ebay for Unidisc wheel covers,
do a modern version for 98USD (also in black)
Alternatively...home build instructions here
or, if you have deepish rims, use the air tight self-doping fabric used for covering RC airplanes. You stick it onto the rim and heat with an airgun, then it shrinks drum tight. Just cut a valve hole...loads of colours available.
All the best,
Pause, take a breath and ask yourself: "What would Rastamouse