how to find mass produced wheels, either aluminum or steel, 18-inch diameter, with 15 mm or less offset, 7.0 to 7.5 in width

[dawes1b]

need to make i3 better riding, handling and not eat tires; the Tire Rack site is not helpful. I'd rather not use spacers. Although Eibach of Germany makes spacers I trust, maintaining wheels, and trusting tire shops not to damage or incorrectly install spacers is a concern. I Saw some old Mercedes wheels on Ebay but they're fat 8.5 inch and pricey.