I would like to replace the rear speakers in my 95SL1. You would think that this should be a fairly straight forward job but for the life of me I can not figure out how to remove the retainer clips that hold down the grill cover. Chiltons isn't any help it just says to remove them but not how to do this. Does anyone know if I need to pry them off with a screw driver or pull them off with pliers? Mark.