Clutch differences for 915/63 to 915/68?

[sjc]

Short summary: What difference, if any, is there between the clutch kits for a 915/63 and a 915/68? I have a 915/63 that I'm putting into an '86 911 Targa (which would have had a 915/68). I need to buy a clutch kit, and I'm wondering if I'm restricted to particular years/model choices or if, e.g., a clutch kit for a /68 will fit a /63.

Longer detail: I'm converting a Targa to electric drive. I got the car without engine or transmission, so I have freedom to put in whatever I want (I have a 9-hole flywheel, and a coupler for the motor tail shaft that fits that, so I just need the clutch kit to complete the tranny/motor interface).

[Bill Verburg]

Originally Posted by sjc

Short summary: What difference, if any, is there between the clutch kits for a 915/63 and a 915/68? I have a 915/63 that I'm putting into an '86 911 Targa (which would have had a 915/68). I need to buy a clutch kit, and I'm wondering if I'm restricted to particular years/model choices or if, e.g., a clutch kit for a /68 will fit a /63.

Longer detail: I'm converting a Targa to electric drive. I got the car without engine or transmission, so I have freedom to put in whatever I want (I have a 9-hole flywheel, and a coupler for the motor tail shaft that fits that, so I just need the clutch kit to complete the tranny/motor interface).

There is no difference, I would not use a rubber ctr clutch, just get a Sachs spring ctr setup as described here, all the 915 clutches are pretty much the same from '72 -86, '77 up got an extra helper spring

regular spring ctr is going to be Ferrous , super is going to be lighter aluminum.