It's of no help (to you) now, but the AL-KO kit comes with a pin that holds the damper in place when you remove the bolts that hold the old coupling in place - remove only one bolt - then insert the pin - then remove the other bolt - fit the new coupling and one bolt - then the last bolt knocks the pin clear.
You may still be able to use the AL-Ko pin to grab the eye-hole of the damper
Robert