i have a 75 ffj40, ordered a new clutch kit, got it, went to put in and noticed it was the wrong one. i have a pre 74 kit in it and the kit i got is post 74. the flywheels are different and clutch fork is different. should i stick with the older clutch kit or get the newer fork and flywheel? does it matter which one is used? if i want to make it the right one is there anything else i need or just the flywheel and fork? thanks for any help