The original Windjammer through Windjammer II, III, and SS (with Leading Edge Lights) used a standard 7" automotive sealed beam; a 7" H4 was later offered. The /6 and later machines used a 7" bulb which could be moved to the fairing.Luftmiester fairings used the OEM headlight and turn signals. Those owners who purchased Vetter usually lost the original parts since Windjammers did not use the original parts.
If you had a /5 you actually made out better because either was superior to the OEM 160mm reflector. And as you mentioned, the OEM 160mm reflector, lens, and ring usually ended up in a box in the corner of the garage to be lost in the shuffle.
This Windjammer is first generation ('71-'73), if you still have it I'd be curious to know what it's serial number is. The oldest known is #1000.