For better guiding of the drawbar eye. Extends the lip by 10 cm. On 575V-2/590VR-2, these fit on both upper/lower lip, also with power actuator. On 575V-3/590VR-3, these fit both the upper/lower lip on manual coupling. If you have an power actuator, it only fits on the lower lip.
NB! Only intended for use together with articulated drawbars.