K-Tech TOMTOM GO 720 720t SUCTION WINDOW MOUNT (SKU 6447) This arm is the same size as your original mount (approx 70mm) Includes square slot in holder that fits the TomTom GO 520, 720, 920 & 530, 730 & 930 GPS SatNav's 60mm suction cup can be used on glass, friction mounts or dash discs. Suction cup has a large removal lip. The lever release expels air creating a vacuum for reliable hold.