Springs just pop the hatch open enough for struts to do the rest of the lifting. I replaced struts when I added the springs. I bought what someone here recommended. Might try searching hatch springs. They are blue, could be coincidence, 3 and 3/8s long and inside diameter just fits over shaft. Been in place for a few years, work great though we don't experience much weather below freezing.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas