You are on the right track with those numbers Tony. You will see that the number 3591 pertains to the seal regardless of which model vehicle it is. The 81T prefix is correct for the earlier lighter box. 70 3591 is the seal for the later(from engine no. 2G-7047F) heavier box.
Terry.
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Terry
F30 13 Cab CMP
Morris Commercial C8
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