Mercedes-Benz Gla Replacement page 6

7- Slide the cleat under the sunroof mounting Repeat the
operation for the other slider so that the sunroof mountings are
both resting on the cleats
8- Check that the 2 cleats are aligned in the axis of the sunroof
mounting
9- Exert slight pressure on the sunroof so that the fixings go down
to the bottom of the cleat. (if necessary use a flat screwdriver to
spread the cleat a little)