i need to order a clutch for my prospector but would rather wait until i have the parts before i tear it down. does any one know how to tell wether it has a 10.5 or 11 inch clutch without removing it and measuring it? its a 1979 d-100 prospector 318 c.i.d. 2bbl 2wd with a A833OD

thnx for the help