The reason listed for including them was simply because the Sandman used the 8WQ main wiring harness.
Quote: "the required 8WQ main wiring harness incorporates all the footwell illumination lamp leads and bulbholders"
Reason for change: "prevent proliferation of main wiring harness". In other words they didn't want a unique Sandman harness.
Effective point is SOP. Cost was $0.36c per Sandman. It looks like it had Engineering Approval early June and lead time quoted is 4 weeks, confirmation is 4/7/77 so i'd say the change probably even made it into July HZ Sandmans. My HZ BO6 Overlander tonner had them, it must have used a GTS harness too due to the quad light nose.
If there are HZ Sandman's out there without them they are possible post the end of GTS? Or some other reason lost to time.
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