We've covered this one before. You can do a search for "head bolts 4zd1" to read the long version of the story but here is the short story:
http://www.headbolts.com has headbolts for the Isuzu 2.3L 4ZD1 motor and those happen to be identical to those used on the LUV. You can also look around elsewhere for 4ZD1 headbolts like ebay and perhaps find a better deal.
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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
