Could have been a change from '65 to '66 too. Early '65's had those Falcon like speedometer/instument panels, so they might call for different bulbs. Just a thought.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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