I don't see why not. You lookin for middle setting and 6" lift or something?
The difference between putting the preload shim on your factory struts to get the 7", and using the 5100's is about 0. The bds preload shim basically does the same exact thing as the 5100 does, it raises the coil seat to compress the coils, which provides more lift. Bilstein 5100's supposedly have some kind of magical valving or something though :dunno:
I assume you are 4x4, or else you would have already considered the maxtrac or cst 3.5" lift spindles, right? Both of those kits can be combined with your 3" spacer for 6.5" lift, or combined with the 5100's for 5.25" or 6" lift, for a lot cheaper than the bds.