C15 w/less van rear door lock

[jim sewell]

I am in the process of restoring a C15 wireless van ( aust ) and have a rear door with out a locking mechanism .
I am not sure what GMH used as the original lock but it was not a lock similar to the front doors or a lock out of a chev cab ( USA ) .
Has anyone in Aust been down this path before or can direct me to a source .
At this stage the sliding bolt is looking like an option .
Regards
Jim S.