These spring cup offsets are purely to allow you to gain a broader range of ride height adjustment.
if you use the -2mm spring cup and your pre-load nut -2mm lower on the shock body it will be exactly the same.
so these different cups are used to broader the range of ride height adjustment on your shock bodies. if you are need the top of your adjustment range on the preload nut on the shock body, you can use the -2mm cup to gain another 2mm of adjustment.
if you are near the very bottom of the threads on the shock body, use the 0mm cup.
as long as left and right are the same and you can get the desired ride height then you are all good.
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Chris Doughty
Team Durango
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