Nice touch by Airfix, although a pity they got the instructions or sprue numbers wrong !
Some late Lancasters had the wider slipstream deflector, even though the original FN turret was retained. Those fitted with the AGLS certainly had the later style, and the rear nav / ID lamps were fitted into the rear faces, as the AGLS gear obscured the bottom end of the rear fuselage, where the lamps were originally.