Yeah and I wouldn't even take my info as conclusive because I didn't measure new X1/X2 against new X5/X6. It's possible they are a ltitle stiffer if the X1/X2 free length is more like 12-13mm longer when new, but I didn't have new ones handy to compare and mine had many thousands of miles on them
What it does say I think is the ZCP springs are the source of the lowering, not any other part
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