OK, mines a Mercedes Hymer B680, will these locks fit to my hab door, there is already a moulded place for additional locks ?
What model is your Merc? Proplates are available for the Mk3 Sprinter, but don't seem to be available for the Mk1 and 2.
If I had a Sprinter, I would be more concerned with fitting an ECU shield, bonnet lock and ignition lock shield before looking at proplates.
Edit: Just re-read your post and noticed you are asking about the hab door. If it is a coachbuilt and not a panel van there isn't a lot you can do in honesty to beef up a hab door that can't be bypassed in seconds with a screwdriver or jemmy.