There's guys at the local Long Beach and Pomona Swap meets that sell a Autopal? brand H4 setup. IRRC, less that $30 each with bulbs.
Try an ebay search on Autopal or H4 conversion.
Hella is a brand name that comes with a price.
I've ran them for years in my Barracuda even parked it outside in the snow for a few years in Iowa.
BUT when I had the car basically parked outside and not driven for a few years even in So Cal the headlights got water and condensation in it. One got filled about 2 inches deep and ruined the inside reflective coating.