AC, none of the Panteras got aluminum master cylinders with single reservoirs. They were all dual reservoir cast iron with screw tops for each individual reservoir. ATE screw caps fit both brake & clutch reserviors.
I earnestly hope you drill a hole in the front trunk floor and install a tie-down stud & wing-nut for that spare! That is the prototype position for the spare, and the assembly launched like a 15-lb missle through the windshield in the original Euro crash tests! I carry mine there, but with a tie stud & nut.
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