19 inch rim size ?
I can't find 2 inch with white walls, but here's a place that sells 19 inch tires by 2 inches. I've bought a few.
They sell stuff for BMW and Puch, but the tires are 19 inch rims, and 2 inches high. They're a good price too!
Then there's Rinke at Rinky Toys in the Netherlands.... He has 2.25 tires instead of 2. If ya think they might fit without rubbing. You can get them in whitewalls. Motor West Inc. doesn't carry whitewalls. Rinke's a little higher priced on tires, but better quality, and _whitewalls_, that I really really want!
Good luck! I hope to see that bike of yours out and running someday!