You have XI, and the XI spindle where the strut goes in at the bottom has a taper that narrows down. This matches the same taper that the strut has at its bottom. I mean the section where the diameter of the strut body reduces. You should place it such that the two tapers match. When tightened this prevents the strut going further down. You can use a small mirror, (auto inspection mirror is best) with a light to see where exactly strut seats from the crack of the spindle clasp on the back side.
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