You will never get mne to buy a diaphragm clutch of any make , C Force is smoke a mirrors advertising not quality , I have seen them last less than 3 days
I use the McLeod 3 Finger Borg & Beck or the B&B Long style with a performnce disc , if you have the 130 tooth flywheel use a 10.95" PP with an 11" disc , if you have the 143 tooth flywheel you can use either the 11" system or the 12" , McLeod also makes a street Twin system that will take 1100 ft lbs