I have a 2004 Siena AWD, without run flat tires (bought used with new tires). It has no spare or a location for a spare. The dealer will sell me the doughnut wheel,, but they do not sell the tire to go with it-- they don't carry that. Tire dealers do not carry the the tire. Junk yards do not have it. Could not find one on the Internet. Anyone have any idea where I can get a 17 inch compact spare? I don't want to end up 100 miles from anywhere in North Dakota without a spare.

Have you tried the dealerships of other makes to see if they can get a tire that will fit the toyota rim?