have you considered trying coker tires? http://www.cokertire.com/ I got mine from there... Great tires but a bit pricey. Or go with www.dutracustoms.com - that guy knows his stuff and gets good deals on tires.
Sascha
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Vintage Honda Owners, Restorers, Riders and Admirers
Latest Registry Entry
1965 Honda CP77 — Ulsan Metro City, Rep. Korea
Restored with original parts — Owner: J. Doe