1. Link above would not work for me.
2. For the newer Sprinter, a company makes Slick Locks which uses existing screwholes.
https://www.sprinterpartsdepot.com/prod ... y-deadbolt
https://www.slicklocks.com/buy-now.html?brand=54
Might be able to modify or custom make the piece which bolts to the door frame.
3. Considerations
A. Use locks for security while away from the van. Then the Heo Safe front door locks and an external padlock type lock on sliding door works fine. Sliding door would be main entry and exit point to u lock and lock up the van.
B. In-Use Locks
The external padlock would not be in-use (safety). Would want a lock which canNOT lock you in by some prankster.
On this forum, there were at least two additional interior locks.
One was a sliding barrel bolt screwed to the rear interior of the sliding door and the door frame. When bolted, this lock prevents the sliding door from opening because the rear of the sliding door cannot open out.
A second alternative was somebody here put a chain and padlock, using the bottom bolt of the seatbelt on the B pillar and the big rubber bumper stop on the sliding door (bumper stop stops the sliding door from opening beyond door frame).
This second alternative could also be used as an external type lock by allowing a chain to be long enough for you to squeeze a hand in to lock and unlock a padlock.
Please post whatever you find or do. Thanks.