I'm a complete zero when it comes to 1st-gen LUVs, but I have a P'up (= to a 2nd-gen LUV). I put a GEO/Suzuki dome light in mine and it's great. It mounts flat, so you don't have to cut out a recess to accommodate the socket. I used one existing mounting screw-hole, and drilled the other. The light came from a Metro, I think, but it was the same as the one in the Samurai and probably the early Tracker. It's brighter than my factory light was, too.
Jack
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'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.comIsuzuPup.com