You can use any shackles you like. Personally, I don't like them that tall, really 3/4" is the most I would do, you start to mess up your camber angle with them, plus total lift achived is only 1/2 of the listed amount, as you only are "lifting" one side of the spring.
I'm very happy with my greaseable shackles, they do help smooth the ride a bit. Many companies make good ones, Currie, etc.
Military wraps use a longer 2nd (from the bottom) leaf that wraps around the first leaf as that first leaf is wrapped around the bushing. It's like having two bottom leaves, both of which form a circle at the end and create the attaching point to the shackle.
Some older jeeps had these as stock, but they might be overkill for all but the heaviest and hardest-core rigs. Due to the fact that the two leaves act more like one, with less ability to slide on each other, the ride is usually stiffer.
'82 Scrambler - NV4500/4.5" lift/33" Toyo MTs/4.0/twin stick, and my windshield washers work! Full 1/2 cab Cage
2004 Grand Limited 4.7 HO - OH Boy!
2010 Grand Laredo 5.7 Hemi - SICK - work vehicle -gone - replaced by an 08 Tahoe - nice ride.
"Both my Doberman and my Jeep can accurately be described as 'black and rust.'"
"I got a fever . . . and the only prescription is more cowbell"