I just thought I'd mention that I added these headlights to an '85 Vanagon of mine:
https://www.amazon.com/gp/product/B01B376YOE/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1They are absolutely fantastic. The lumen rating is over 3X the stock halogens yet are lower wattage so no relays are required. The install was totally plug and play. 10 minutes total. I then adjusted them per this procedure:
https://www.danielsternlighting.com/tech/aim/aim.html Adjustment took ~1/2 hour all told.
The lighting is astounding. Clear bright low beams with accurate cutoff to avoid blinding other drivers. High beams are excellent. These made that van go from the worst lighting on any vehicle I've owned to easily the best. Considerably better lighting than my Mk4's. Fantastic upgrade for <$100.
I believe they would also be plug and play for the Mk1 round headlights.
I wish we would have had these when I did my MK2 to rounds
Wish I would have thought to look for these a year ago when both lights needed to be replaced.
Running off individual relays helps with both brightness and wear and tear on the switch. I did that to my Rabbit and it made a noticeable difference.
I got a set of the 7" rounds for my '79 rabbit. They look great and the visibility is incredible compared to the stock bulbs. Installation was totally plug and play (10 minutes).