On my 2007 Trailblazer (base model) the plastic seat cover on the driver's side has become disconnected - it just flops around. This has the manual, not electric adjustments. Can someone please tell me how this is supposed to be attached to the seat? It won't come off completely so I can't see what kind of mechanism holds it in place. Tried looking for a parts diagram that would show it, but no luck with that.

Thanks in advance!
Dave