coil spring lifting
the problem with rubber inserts inside of springs is when the spring is fully extended it is possible for the rubber part to get twisted or pop out... I've used these before on the back of an old chevy wagon, not the kind linked above (mr. gasket), but just a chunk of rubber inserted in... I think the mr. gasket insert would work well, it will compress, but add a little bit of spring and may stay in the spring upon full extension.
the spacers that metal nerd sells are pretty common for lifting jeeps with coil springs, I've used them to get 2-3" on xj's, they also work on tj, wj, and zj's... I've never bothered to realign my front end
afterwards and never had any issues, but then again the jeeps are live axles and we're dealing with ifs.
I may try the mr. gasket inserts to give a little more lift to my wagon and they'll also add a little bit more capacity to the springs...
I'm still thinking setting this thing up with full bash plates, a nerf bar in the front and sides and a lift... the only problem is I know that if I ever get into any kind of serious off-road situations that it'll be totally useless and quite embarrassing...
FWIW, I've hit my Panzer plate twice since installing, which was right after replacing the oil pan,
and the curb I hit has really been battered, I'm not the only one that's been impaled upon it. I wonder if I could have any recourse by complaining to the county...

I hit a pot hole once with one of my caddy's, cracked the lower arm, bent the rim... they paid for it... took a while, but they did.