I ran across a local guy that had a few interesting vintage lamps and bulb sets for sale, and among the ones I bought were a pair of NOS 5.75" Zelmot H1 housings, and an identical used pair in like-new condition. They look to be well made, and the dust boot design seals very well. I did a search here and didn't come up with anything... any info out there on these? I haven't plugged one in to check the beam pattern yet. I stuck one in a Grote housing I had, thought about using them on my '63 VW Convertible or '89 Festiva as driving lamps depending on the beam pattern.