Can't answer the C67 on your disk except that some of the clutch manufacturers and rebuilders often have their own numbering system. On older Fords if it was a Genuine Ford part the Ford part numbers were stamped into the disk center later on they used a painted number. If the disk is still in its orginal packaging you could I'd it from the Ford part number.
The first year Ford started using the excellent 3.03 trans behind the 200 six in Mustangs and other Ford cars was 1967 that's why your disk won't fit the T5. Well that's excellent since you have an extra input shaft you can use it both for your disk hunt and as a clutch alignement tool too when you start to assemble the parts.
The first year Ford started using the excellent 3.03 trans behind the 200 six in Mustangs and other Ford cars was 1967 that's why your disk won't fit the T5. Well that's excellent since you have an extra input shaft you can use it both for your disk hunt and as a clutch alignement tool too when you start to assemble the parts.