I use this product and make my own. Very good thick vinyl for number panels works great.
http://www.motorcycle-superstore.com/4275/i/factory-effex-universal-number-plate-backgrounds
I get it at my local MX store.
Electrical tape?
Bryan! just use bulldozer yellow tape, or caution tape, that way people will know when you’re coming to plow all the karts out off the track. Lol
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