If you just mean the plastic covers on the mounting points on the ceiling, on my last xc90, they just fell out after a while from continued use of the cargo net, so there’s no rocket science to what’s holding them in. Underneath them are the welded connection points that the lugs of the net fit into. I’m guessing this is what the fixed guard attaches to?
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MY21.5 XC90 T8 Recharge R-Design
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