Just FYI spring rates don't mean anything without knowing free length, wire material, thickness, coil pitch, etc.
Unfortunately, I learned this the hard way. Did plenty of research into every spring avail for these WH/XH's, have a giant spreadsheet to prove it haha, and only focused on the claimed spring rate.
I personally have experience with King Springs, Dobinsons MD, OME HD, Dobinsons MD, and x2 sets of Lovells HD springs in XH/WH's.
On paper the HD Lovell's for a Commander are by far the stiffest (claimed 750 lbs/in front and 390 rear) avail, but in reality are only marginally stiffer in the front and about the same stiffness as Doninsons MD (claimed spring rate of 576 front and 274 rear) when driving around. This is on my personal Commander CRD.
On my brother's Commander CRD, there was a noticeable difference going from Kings (claimed 530 front, 295 rear) to Lovells HD where front and rear were stiffer, but not massively despite the numbers suggesting it would be heaps stiffer.
OME HD springs seem to be stiff on paper (not as stiff as Lovells) but in reality, in my opinion the firmest ride of all especially on a WH. They claim 630 front and 280 rear, and don't appear to have different springs for WH vs XH. My friends WH Hemi rides very firm with them, planted on road, doesn't pitch or roll remains very flat, a bit harsh offroad (most report OME being too harsh), and have ridden in a XH CRD with the same kit (from Murchison Offroad) and it was firm but not as much as the WH, and about the same if not a touch firmer than my Lovells HD Commander setup.
Sorry this may be more confusing than what you were already considering, but hope it helps and you don't fall into the same trap as I did only considering claimed spring rate as the benchmark to compare all springs.
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