im not sure exactly which door sill parts youre referring too...there are two pieces along the floor...ones a larger plain plastic piece that looks like a rectangle...if youre talking about that piece, you need to pull it up from the end closest to the rear and snap it out (it uses snap-clips to hold in place) ...just do it slowly and not on pressure points in the plastic to avoid bend crease marks....now if youre talking about that little black plastic thing that has a mustang on it and sits just to the outside of the rectangle piece i just mentioned....then you have to slowly pull it out....its attached with a glue-like substance and little plastic "clips" (i believe)...i know they dont go back on without re-gluing them though...so you have to be careful pulling them off, but they will come off without breaking!
now for the button...UPRproducts.com has instruction for replacing those...basically you take a screw driver or something like it and pop them out...but you have to be careful you dont scratch your door panel's plastic or break the button...id suggest a knife with foam around it or soemthing to that effect...
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