145w is mains. First number is always mains. High watts need for distance and lesser needed for dip as it is pointing down. Lens pattern defines the dip pattern. Original PV lamps were symmetrical and relied mostly on the filament position to change the beam angle.
Perhaps stick to 60/55. LEDS legal pre 1986 so you could go down that route but you still really need an alternator for them.
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