I have a 1967 SS350 convertible. In trying to save space in the trunk, I would like to use a compact spare (donut). Does anyone know what year GM compact spare would fit the 1967 hub?

I have 14x 60x 235s and these just fit in the trunk as a spare.
So I measured the diameter, then off to the tyre shop, found a narrow tyre that fits the orginal steel rim of the same diameter, and use that.
If u have a posi diff, and use a spare of diff diameter to the wheel on the other side, the diff can make bad noises, and Im sure this is not good if u have to travel any great distance.