Yep icepack is spot there, I'd recommend further that you either buy them from SSL or Cain at Wolf Performance then you won't have issues with the operational length of the shock as they know by car exactly what is required.
Just as an aside, don't measure your current shock open and closed lengths as quite a few cars that have had changes have the wrong shocks fitted!
I'd also suggest that you obtain and fit a set of Rog's bump stops. They are not just bump stops but also act as suspension assisters, stopping/slowing the suspension which would otherwise bottom out in quite a gentle manner yet in normal suspension travel range have no effect. I can honestly say that these were the best thing I did to my Mog and that was when I had ten year old original shocks still fitted, I later fitted adjustable shocks from spax and setting them at four clicks up from the lowest setting found my plus 4 rode fantastically well, an unimaginable desire prior to this set up!
