it'll be Christmas Eve by the time you read this, so first off, Merry Christmas. The long side, is 42and3/8", or for you, 1083mm, the short (hinged, facing the rear of the car) is 41and3/4", or 1035mm. It's 5and7/16", or 138mm in width. The large radii is about the diameter of a 500ml dairy lid...