Is there such a thinng? 12" x 3"-3.5" slick

#1
Something square-shouldered to look as much like a drag slick as possible... I thought trailer tires, but 12 x 4.80 is the narrowest I've found. I have a Kz80 rear wheel for a custom mini made from a Northern+Tool/Asuza frame

Anybody got any ideas?
 
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