Reply to "Spare tire options or solutions"

Three choices: One either carries a spare, or a tow service and a good cell-phone to call them. If you opt for a spare, a collapsible makes sense. You will have trouble carrying a full sized tire in any Pantera, and if you have a flat and there's a spare aboard, be sure you also have a bungee cord, 'cause even a deflated 225-50 x 15 on a 7" Campy will not fit in some trunks with the lid fully closed. Anything bigger is even less able to fit; your wife or girlfriend may not immediately understand why she must share 'her' seat with a dirty, $1000, 50-lb 10" x 15" Campy wheel & flat tire... The bungee stretches from latch to the bumper so you need not leave the flat behind. GR-4s at LeMans carried their mandatory full-sized 10" x 15" spare strapped directly to the ZF with no trunk insert.
A stock 40-yr-old collapsible is not a good idea due to age, but many modern cars come with newer collapsibles in our size (215-70x 14 on a steel Ford wheel) to clear stock brakes. It will not clear most altered brakes. Used on the back, it can indeed destroy the posi-clutches in the LSD if you drive over 50 miles. Less distance = less likely to damage anything. The collapsibles, being basically 3-ply inner tubes, are recommended only for 50 mph max for 50 miles max. Mine is mounted on a super-light drag-race wheel, since it's use is so restricted. Also note- ANY tire store in the country can mount a collapsible tire on a rim, or dismount it. If they care to do try. I've had them done at corner gas stations by a skillful operator. He will not be able to simply put the parts in position and punch a button on a compuerized mounter, keeping his hands nice 'n clean.
Next- if you have big brakes, you'll need a larger rim for your collapsible, and a big rim with a larger collapsible likely will not fit the stock cutout in the trunk insert. The rim might also need its own lug nuts if they're different than a stock Pantera.
Finally, there are two different inflator cans available for collapsibles: one has inert gasses to inflate a tire while the other uses PROPANE! These last have 'cooked off' in hot Pantera and Mangusta trunks, causing explosion damage. Look at the can's label: if it says 'DANGER- EXTREMELY FLAMMABLE, put it down gently and leave the area- fast! It is a bomb.
A seldom-mentioned third possibility is a small section high-pressure spare. This looks like a motorcycle tire on an 18" dia, 4" wide forged-aluminum rim. Porky mid-'80s Thunderbirds carried them stock, but the bolt pattern is wrong for a Pantera. It is a marginal fit in a front trunk but fits the rear OK. I have one altered to fit a Pantera bolt pattern front or rear, even with with giant brakes. You will need to check its pressure occasionally as they must have 45-60 psi to work effectively. And you don't won't get that from a can. An on-board compressor will work, but slowly. Choices....