I used a thin spacer like the JW Whitney ZX816449N at

.
Note that it had to be clearanced for the 5.5" bolt circle. You can also remove the three rubber bumpers from the rear door to gain a bit more room. Wheels with significantly reduced backspacing (negative offset) may not require this adjustment.
A good wheel tech site is
https://www.rsracing.com/tech-wheel.htmlWhen I installed OME springs, Petroworks persuaded me to get new shocks. They recommend and offer Gabriel Gas Rider Shocks on their suspension page -- they were a good choice for a rig that sees a lot of asphalt. Between the OME springs and new, softer shocks, the ride improved immensely.