Noticed that too. Someone got sick of blowing CVs at some point.
OK, we're slowly getting somewhere... so you have a manual SWB SE420 Vitara running the Calmini kit and 5.12 diff gears. That's a good start for 31s, otherwise you'd be clutching and revving the shite out of the poor little thing. The other gearing option is transfer reduction gearing - lowering the Lo for better torque and control off road. Something like $800 plus installation, but along with lockers generally considered the best mod you can do for off-road performance.
So you've investigated Rancho, Tough Dog and Ironman? Are you just talking to a sales rep?
Also look at Old Man Emu (ARB) Dobinsons, Bilstein, Monroe, Gabriel, Doetsch...
I bought my Ranchos through 4WD1.com after an exchange of e-mails about what I needed vs what they recommended - not always the same thing.
As Sco-tie mentioned bigger bore shocks can be worked around using shock mount
relocators which space the shock away from the diff:

But bear in mind that your car weighed just over 1000kg from the factory, whereas brands like Tough Dog and their fancy big bore adjustable foam cell gas charged malarky is aimed primarily at the 2.5T+ patrol/landcruiser market. (Nothing against TD, I ran them for a while and the quality and durability was great, but they were much too stiffly valved for my car, even at 1800kg loaded up.) Even the Ranchos I'm running now are only really functional on their softest setting. I don't know how the non-adjustable 5000 series are set up, but it would pay to ask before you...erm... pay.
Plenty on here have been running cheap generic road car (commodore) shocks for years, so don't get too hung up on the bling and the specs.