Isuzu-built trucks are pretty much across the board 12X1.5mm. My '99 and '01 lugs are interchangeable and also cross with the lugs from my '88, '93 and '95 Troopers. Don't ask, I just got curious and checked (seems I'm a parts pack-rat!). And, just for kicks, even though Nissan 15" wheels fit the lugs don't. ;pg; Most definitely test though as mentioned above, especially with aftermarket.
Isuzu - Wheel Bolt Pattern Reference
From McGard's site (note the "ALL truck 83 - 04):
Search Results for Isuzu ALL TRUCKS (Except Oasis & Hombre), years 83-04
Thread Size OEM Hex Size
M12 x 1.5 19mm
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