Originally Posted by Lornce
Completely different ignition switches.
Yup.. and the 1974 /6 combination switches on the handlebars are the same as the /5 switches.
Also, the 51-25-1-233-279 part number he listed is a 3-position /6 ignition switch set (and that part number includes the fork and seat locks) for 1975-1976. The 1974 ignition switch is a 5-position, and as has been said, the /5 ignition switch is completely different (and its part number is 61 32 8 048 100).