The lowering blocks I have are for the coupe however I believe the early utes had identical leaf spring width of 50mm - in terms of the axle housing width I'm unsure - it may be larger as the utes had an H165 diff.

From centre to centre these bolts are 78mm wide, and from inside edge to inside edge 67mm - that may help. As long as the diff housing is smaller than 67mm in diameter they'll fit!