the slider rails were I believe for the original canvas top....you could slide the arms forward out of the way so the top folded down against the windshield . Some people still mount biminis using that style but I like mine out on the gunwhale for more room inside.
not sure of the original setup on those teak hatches on a 78....I'm sure someone will answer your question in no time.
and remember the old saying somehing about the only dumb question is the one not asked....or something like that.
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1986 V-20
1986 Yamaha 150 HP
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