Clutch disc diameter?

I got some help from a friend here, and following his advice, I upgrade my clutch to 10"
I wasn't sure that my bellhousing and flywheel would accept it, but this friend has a '71 Barracuda with the same 198ci than mine and he has a 10" OD clutch.
I ordered this one from Rockauto :
More Information for M-PACT 05004

:thankyou: all for your help and your time
François