It certainly looks too short. Maybe it is for a model that just has a plug and doesn't have the oil filler pipe? FCPEuro doesn't list any fitment for it. It could be a mistake. They also sell a transmission dipstick that has the same level markings at the bottom, but it specifically does list the SLK320 under fitment. I have used one of those for my ML320 and plan to use it for the XF. I have used the red locking tabs as well, but I also bought a new cover.