There is other firewall stuff too as Greg suggests, console mount differences etc but I didn't bother with that as the query was on the tub bit. I think the early ones also had removable panels over the rear chassis mount bolts, later were welded in.
You only need to drill 2 x holes Greg to fit WB bucket seats into HQ-HZ, I thought it was only 2 as well for the reverse ie HQ-HZ buckets into WB.
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