Put my LR4 back in it's native state, on jack stands in the driveway. I really want to run 18" steel wheels, but don't love the idea of spacers. thought I saw somewhere that the LR3 front brake caliper bracket (SEH500013) is a direct fit, so for $100 I ordered one. It does indeed fit.
I've since ordered LR3 calipers from FCP Euro (179136, 7) for less than $100 each. A set of EBC rotors and pads for an LR3 are on their way too. If you need to replace your brakes anyways, it's about $400 to convert the brakes versus the $250 for spacers.
18s fit over the rear assembly no problem.