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Aftermarket body lifts replace the rubber body mounts with thicker ones. Nissan lifted the 4WD D21's cab by modifying the body mount brackets on the frame. This thread on Infamous has pictures showing the difference. The 4WD D21 brackets sweep up, while the WD21 and 2WD D21 brackets sweep down. The bushings themselves are the same (I confirmed one of them by part number). I have not confirmed that the D21 cab and WD21 body have the same spacing from the top of the bushing to the floor, but I don't see why they wouldn't, so I am assuming that they do, and that the difference in body height is entirely due to the brackets on the frame. Finding the height difference of those brackets took longer than I expected, but as usual, the service manual had the goods. All info below is from the BF section of the '95 service manual. I did not cross-check this information against other years because I've already spent far too much time in this rabbit hole and I would very much like to come out now. The BF section has coordinate measurements for a bunch of different points on the frame, including the body mounts. Each point has an X, Y, and Z value. I'm not sure what sets the zero point for the Z axis, but I know it's in the same place on either frame, because the front-suspension droop-stop bumper holes and the compression rod mounts match perfectly. (The front shock mounts do not, but neither do the part numbers for the shocks, so I guess that's just a D21 quirk that I was not aware of.) This means that we can directly compare the height of the body mounts between the two frames. I'll spare you the math--each one of the 4WD D21's cab mount points is exactly 50mm higher than the corresponding mount points in the WD21 and 2WD D21. In freedom units, that's 1.96". TL;DR: the D21 ARB bumper should fit a 2" body-lifted WD21. And yes, a body lift would leave a gap over the rear bumper, but you could fix that pretty easily. Slice the brackets, lift the bumper 2", weld the brackets back together. Even if you half-ass the welding, they'll still be stronger than the bumper they're bolted to.