The only place I can think of for the wheel is Martin but it's a long shot as they are like hen's teeth.
The stud pattern for the wheels (5 studs) is 127mm pcd , same as rover p5, SD1, pre 89 Jeep Cherokee - also 5 stud Ford P100 pick up & some new transits but not sure if they are 14" or the size of the holes plus they will look very different from the originals. The wheel nuts are conventional and undo like any other nut so the original Commer jack is fine.
I'm surprised your van has 14" wheels as early vans are normally 15" and only later Dodge vans with 14's.
The stud pattern for the wheels (5 studs) is 127mm pcd , same as rover p5, SD1, pre 89 Jeep Cherokee - also 5 stud Ford P100 pick up & some new transits but not sure if they are 14" or the size of the holes plus they will look very different from the originals. The wheel nuts are conventional and undo like any other nut so the original Commer jack is fine.
I'm surprised your van has 14" wheels as early vans are normally 15" and only later Dodge vans with 14's.