I tried to make my own with no luck finding a material that would stay put and not wrinkle up. I was ordering a bunch of parts from justforjeeps anyways and ordered these. I dunno why the black is twice the price. Shipping not included.
it took like two minutes to make them. the foam i used has worked great! i used small cans that fit in the holders snug as my templates to cut the circles. $0.50 is better than $30 haha