My SGM 135i came with a really odd adjutment on the boot lid, the top of the trunk fit below the fender line. (See pix.) - Almost every opening panel on a car will have a means of adjustment and a little visual inspection turned up the adjustment point for the rear deck lid (deck, boot, trunk, can't think of many more ways to call the dam thing ; -)
So here it is:
- Open the boot
- Remove the plastic cap over the 8mm screw
- Raise or lower the screw as needed
- Replace the cap and test the fit
- Remove the cap and readjust
- Repeat until the fit is where you want it to be
Remember, the adjustment will be a compromise between the fit of the decklid at the back light and at the rear of the car.
Complexity 'stars' - none, my dog could do it if she had opposible thumbs. ; -)