The scorp cossie SALOON arb is roughly the same shape, but the part that is the rear most around the diff is a LOT longer and will foul on most cossies, hitting the fuel tank, though is ok with some pattern tanks.
I have a poly diff mount, and a tow bar that has TWO massive hunks of metal bracket there in a "U" shape from shell to bar, and a 22mm adjustable rear arb, and have room, was a pig to make though, out of correct sprung material that the oe bars are made from on cars.
The cost was £80, but I gave him £100, as mine was made on the car from a straight bar of the metal ENT40 I seem to remember(?), so worth considering, certainly no more than some cowboys are asking for escos ones.
It's not all plain sailing though, the car WILL handle very different and need getting used to, being a lot stiffer at the rear the front will wash out/understeer in comparison to previously, so need to have a good jiggle with springs/rates and tyre pressures to get the best, the car can be "balanced" via tyre pressures.
Still imo well worth doing, but for those not already on a poly diff mount get one first, these will take away a HUGE amount of the roll, due to far better location, and are what I would have if I had to choose and have just one thing ie a choice between a poly mount OR a 22mm arb, would be poly for me everyday.
tabetha