Issues answered...
Warmonger: not sure what your question is, but let me re-explain. If you bought Bilsteins back when you had OEM springs, those shocks will be to short when you upgrade to National spring packs. The Nationals give you about 2-3 more inches of droop, thus you'll need longer shocks... unless you install this UB Skidder which will relocate your shock mount about 3 inches higher, thus compensating for that additional droop gained at full flex.
The opposite is also true, if you bought longer shocks to go with your national spring packs, you will need to ditch them if you go with the UBSKidderz, otherwise your shocks will be too long.
Brent: The spring pin bolt head is recessed in the "center hole" see the first pic... No way to shear that booger off. I think the OEM packs have the threaded portion on the bottom so some threads may hang low. Easy fix, just invert it when in installing the skidderz.
Wilbur: Agreed, relocating the shock mount higher is prefered, but relocating without getting shorter shocks could be bad. You could probably get away with it but we have not tested such a setup. The side mounts relocate the shock mount quite a bit. Your talking about an inch difference.