ONLY the GM/H assembled vehicles has the 18" wheels with a 10 x 7.25 bolt circle and 12 dividing rim bolts. I have not seen a chassis code for these vehicles, but they are not completely manufactured by GM/H. The chassis and major components were sourced from GM Canada, with local items like the cabs and wheels made here. As their payload rating is the same as the 1543X2, but assembled here, the code may well be something like 1543X4 (X4 for Australian assembly).
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