If anyone can tell me the first year for disks on the bus, please let me know.

I think it is 1970 but can anyone tell me conclusively?

Thanks,
...Markus
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'66 "CERTIFIED!!:-), rough looker, on startup blue smoker, ball-jointed,
     in need of a new top, hackjob skylit" Westy aka "The Tardis" 
                        (british racing green/white)
'74 "in need of a new top" Thing 
                        (pumpkin orange)
'78 "in need of a new top" bug 'vert
                        (black, white top)