Exbiker
Hope you are able to find a suitable replacement unit and that someone on TM can shed light on an alternative.
Maybe worth having a chat with a dealer; someone like Graham (Parts Dept) at Melvyn Rutter, who seems to have a huge knowledge of these things?
ps. Not a problem I am ever likely to face; as Stanley doesn't even have exterior door handles; (and gets jealous when I look longingly at Aeros!)
Good luck
