In the olden days there were "brown goods" retail mags
we got for free. The one I remember was Dealerscope. This type
set is often there.
If you can find an old SAMS collection you can do a search but that may
not have a pix. so you may miss it.
Same with Moto OEM manuals.
Watch e-bay for sales brochures.
BTW search between 1967 & 1970
73 Zeno
LFOD !