yeah right that makes sence... 80 x 80 ( 80 sq ) so it must be a combined face size of just 80cm....overall .....eiher way I replaced mine with the OE ones.... just in case ....
80 square centimeters is either a rectangle of 10 x 8 cm, or a square of 9 x 9 cm or a circle of 10 cm across.
80 centimetre square is huge and would make a good air brake!
FR