[ http://twinturbo.net/nissan/300zx/forums/technical/view/964331/Window-RattleLeakButtonMolding-Fix-Write-up.html ]
[ http://twinturbo.net/nissan/300zx/forums/technical/view/938893/Fabricated-Window-Lift-Brackets-replace-broken-OEM-plastic.html ]
I don't think these deal with your problem specifically but they're window related.
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