The adapter is used for a Becker-Navi in Vectra-C / Signum. The lower support strut is variable mountable at two positions. I, however, do not use, so the Navi sits closer to the ventilation grille and not so far protrudes from the dashboard. The two slat holders can also be released again relatively easy - it's easier if you have previously tried this time in the "dry state". The Navi is stuck, wobbles and does not rattle. Removing the Navis's out of the holder better with both hands, because the magnetic holder of Navis's is very powerful and the ventilation slats still remain easy to move despite mounting.