Since our cars are mostly plastic, what are you guys using?

I want a reusable set, whether it be static cling or magnetic.

Please post pics, size of number, where you put them on the car and what they are made out of.

Will the magnetic ones stay on our rear quarters?

I had some magnetic sheet numbers on the rear 1/4. They worked good for AX. The cling numbers I tried fell right off. I would probably use tape + magnetics at HDPE, or better yet just paper printed and taped all the way around. Get the leading edge tape stuck down well.