Confusion indeed. If I remember correctly, on a pushbutton Pantera, (its properly called a 'dash-1-1/2' ZF by Lloyd Butfoy. The dash-1 is a Mangusta ZF. The 'dash-0' ZF is a GT-40) the dash-1 & dash 1-1/2 ZFs use a 1" /10 spline disc while the ZF dash-2 uses a 1-1/16"/ 10 spline. So on an early ZF, both discs will physically fit the clutch input spline but one will be a quite sloppy fit & take a lot of adjustment to work. On a dash-2 ZF input shaft, the early 1"/ 10 spline disc will not fit at all. And the discs come in 11" OD and 10-1/2" OD (for Mustangs).
Be careful with Centerforce clutches- they sell a 'heavy duty' pressure plate which on even a late linkage-assisted Pantera, will be awfully stiff in spite of their reputation for light pedal pressure. Be sure someone didn't look at your Pantera, think 'monster engine/race car' and order the heavy duty racing unit. Good clutch but impossible to drive around town; competition only. Centerforce also uses different bolt attach sizes and I think a different bolt pattern so you need a redrilled or aftermarket flywheel which they recommend with all their assemblies. A vendor will be helpful- maybe vital.