On long journey's I carry a tire plug kit, fix a flat and a compact tire inflator, with the last resort being the AAA card.
Internet research seems to show that the overall dimensions of the commonly available high-pressure spares in most sizes will be 24" OD x 4" thick. Put the inflated tire inside a tasteful cloth bag and the pkg might fit behind the passenger seat back? That would solve the fit-in-either-trunk problem. Chrysler and Ford both use a 5-on-4-1/2" bolt circle, as well as many Japanese cars that use the -5-on-114.3 MM which is the same dimension. So their OEM spares should bolt on to a Pantera- if the spindle register circle is the same.
wasnt it mentioned some time ago a Datsun spare tire fits ?
Some '70-'80s Datsun wheels (5-on-114.3mm) fit the Pantera bolt circle. But that was 40+ years ago. Not sure what bolt circle or type of spare they run these days, so whether a new one might fit or where you might carry it aboard our cars could still be a problem. Ancient spares are a safety issue. And there's always the ZF limited-slip clutch wear problem to contend with, since NO modern spare tire ever invented will match the 26.5"OD of a Pantera rear tire. At least none I could find. Using my stock spare for 55 miles cost me a ZF diff rebuild.
Interesting.
Thanks again.