I thought they were something like 5001 for the Hi beam and 5006 for the low beam, in generic auto bulb part number speak. Seems like the 5.75" ones have gotten harder and harder to find, and even the 7 inch 6024s for 78+ LUVs are not sold everywhere.
I've been meaning to pick up a swap kit to be able to use new style H4 bulbs in my 79 that has been converted to 4 light. When I had it running last I was using a couple of bulbs that were Toshiba, factory original sealed beams.

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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)
MEPR: Man, my 4x4 makes all other LUVs look good
