You're going to be hard pressed to find something skinnier than 155. I've seen 135s, but I don't remember where.
It's a little weird, but try your local speed shops that carry wheels. See what offers for front wheels on some doorslammers and see if that could be adapted, if nothing else, to your rears. Draggers want the same thing out of their front wheels as you do - some rubber and steel to keep the frame off the ground, minimal rolling resistance, etc.
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Lead or follow. Either is fine.
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