I just sorted out the boot on my 160SR, was getting rattles and rubber noise over bumps.
I adjusted the boot lock eye in the bumper as much as I could but to no avail.
Ended up unbolting the lock in the tailgate, pushed it up inside and put a couple of washers inside to bolt through, then pulled it back out and put the bolts back through the washers to lift the lock up and pull the boot down tighter.
All rattles gone and car is really quiet. (Y)