Front bumper, two studs (FHS2614 with plain and spring washers and nuts) each side with slotted spacer plates (as required):
Mounting points through reinforcing plates on the rear valance - two studs as above each side and the upper one in the middle. The upper ones go through into the boot space and the others below the floor:
An odd (in both senses of the word) hole one side above the cut-out for the exhaust which seems correct for original panels, some replacement panels have a matching hole on the other side. One each side is needed on CB cars with the number-plate lights in the over-riders and in the ends of the quarter bumpers for North America in 1970. Non-North American models from Jan 1974 had them mounted on the bumper itself, close together below the number-plate, so these were possibly daisy-chained with only one cable going through the rear panel instead of two, but the Parts catalogue doesn't bear that out. RB always had them on the number-plate backing plate on the rear panel wired separately. That one hole could be a hang-over from the end of CB production, but bumper mounting and hence that part of the panel was completely different so that doesn't make sense.
Side mount spacer BHH1576 and bracket BHH1575: (Moss Europe)
Fitted, these do not need to be removed from the panel to remove the bumper, it simply slides off:
Slot in rear bumper that engages with the above bracket: