Hey - I'm glad you asked that question - they were fun!
The strips were just cut (with a utility knife) from a wider length of fabric-reinforced neoprene conveyer belting that I mail-ordered from McMaster-Carr ~$100 delivered, IIRC.
Attached with self-tapping, black coated, stainless-steel screws into the plastic valences or sheetmetal - piece of cake, and seem durable.
<edit> - the flap in the front is to slide my jack under!
Forrest
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