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I'm not aware of anyone who makes a true 10.5" 18 spline clutch disc anymore. They were never used from ma mopar.



Right out of current MP Catalog. P4529138 Clutch Disc, 10-1/2", 18-Spline, Dodge and Plymouth V8



They were used on Hemi and big block A&E bodies with a 130 tooth flywheel. B bodies used the 11" with a 143 tooth flywheel. You have to have the proper bellhousing for each size clutch so the starter will work.



Starting with the 1970 model year everything with a big block used the 130 tooth flywheel, the hemi and the big blocks used the same bellhousing. If you want to spend the extra money and buy a new bellhousing and flywheel, among the other parts Wayne mentioned, to use a clutch with a gimmick that is your prerogative.