I can't see how there can be any get-out-of-jail-free card for the dealer as the issue doesn't have its root in the owners opinion. Take the car to the dealership with a tape measure, ask management to measure the fitting footprint then ask them if it is meant to be fitted asymmetrically. If they don't bend over backwards to put this right inform them you have an email with the above pictures drafted and ready to send to BMW head office, but you're a reasonable guy who doesn't want to kick up a fuss unless it's necessary.....so is it?