['97ventureowner]

Have you looked at Tirerack.com's offerings? They have quite a bit of a selection. I agree that it is harder to find whitewall tires. I believe they have gone out of style with most consumers in favor of lettering or just a plain blackwall. All of the tires Tirerack offers come in 3 ways, blackwall, raised white letters or white outlined lettering. plus with the demographic of owners of these vehicles getting younger, the favorability of whitewalls is even less as they tend to like "sportier" versions.
Just a side note, according to Tirerack's site, the RM came with 2 sizes of tires as OEM from the factory, 235-70-15 and 225-70-15, and they recommend you check which tires your vehicle has. (That's all fine and dandy if you still have the original tires or the former owner hadn't changed the size.) I wonder if the sticker on the car with the air pressure recommendations specifies which sizes came on which vehicles.)