The Eaton coil-type and Schwitzer bar-type clutches were used interchangeably (diifferent part numbers and appearance configuration, but same functional specs and attachments, shown as "Opt." in the Assembly Manual); either type is correct. The 1969 clutches used a larger 3-1/4" bolt circle at the fan-to-clutch attachment, and a larger bolt circle at the clutch-to-water pump hub attachment.