Just giving this some thought; what you need are the spare tires from the heaviest all wheel drive car with the same bolt pattern as your car.
The AWD cars need a spare with same diameter at the other tires, and with a heavier vehicle the spare has to be built to handle that.
4 of those tires on a Metro might last for a year or 5 while giving the gearing for good mileage.
There were AWD versions of many minivans too, check out their spares.
Ian
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