Sorry guys, I was talking about the courtesy light switches in the door jams, not the footwell illumination. HX doesn't have the footwell lamps. HZ definitely does, I have the program change request signed off for it. They were added because the HZ Sandman got the HZ GTS nose hence got the GTS wiring harness and lamps came with it as part of the harness. It was approved for production on 4/7/77. It is documented in other places as well.