I'm unclear as to why a skid plate wont fit with a lift. You're talking about replacing the stock skd plate underneath, right? When you say diff drop kit do you mean the spacers or the replacement?
Mine attaches to a tube frame and that attaches to the differential bolts. The skid also attaches to the bolts that hold on my tow hooks as well.
I removed my diff drop spacers, since it made no difference at all, so my front skid wouldn't need any "adjustemts".
Mine was made by Demello Offroad and I have 2.5" of front suspension lift and a 1" body lift.
The aluminum plate is part of the front bumper to protect the radiator, not part of the skid plate I'm talking about.