Early 73 build…does it have (in addition to what you mentioned) the later style door latches? That was the year where US regs required steel crash guards in all of the doors, plus new door latches that are recognized by a metal loop in front of the B and C-pillars (still used). Just wondering because they could swap all of the parts you mentioned while using an early entire welded-up body that would technically be worthless for the 73 model year without modifying the pillars and doors. Of course, they could go ahead and swap the front bumper even if they did that.
Agree about the parts manual…seems to be an omission, in that it doesn’t show a separate parts breakout for 73 on the hinge diagram, although it does for the bumper parts.