Mercedes-Benz SLK-Class 2012 Owners Manual - Manual (Page 260)

Do not place several floormats on top of each
other as this may impair pedal movement.
X Slide the seat backwards.
X To install: place the floormat in the
footwell.
X Press studs : onto retainers ;.
X
To remove: pull the floormat off
retainers ;.
X Remove the floormat.
258
Features
Stowage
and
features