Note 1: The junction in the green/brown for the two reversing lights is done with a sealed connection under the off-side light and not with bullet connectors. This is because the connection to the light units is with a plug and socket instead of with tails as is the case with all the other lights. A bullet connection between three wires all from the same harness would be pointless.
Note 2: Originally the two earth wires go to a number-plate mounting bolt. Possibly all RB cars but definitely 1977 and later (and 1974 North American with chrome split rear bumper) those earth wires go via bullets shared with the earth wires for the number-plate lamps.

The reverse light switch seen through the gearbox tunnel, right-hand side:

The sealed junction by the right-hand rear light:

The 2-'pin' (actually two female spades in a three-position holder) arrowed:

The spades are smaller than the 6.3mm standard at 4.8mm: