438 no seatbelts in the rear
481 can be just a protective layer on the underside of the car
205 is manual and maintenance booklet in English
812 is rear-mounted loudspeakers with fade control
623 is the colour of the car: Ivory (you can see the 623 in the top right, that is where the colour of the car is indicated)
255 is upholstery = Cream white MB Tex