Late Style (Gold Colour) - Stepped Shaft
Early Style (Silver Colour) - Parallel Shaft

It is easy to tell if you require the early or late type of circlip -
If your winch is fitted with the black spring disc washers between the circlip and the outer brake disc, and the end of the main shaft is narrower than the body, then you require the late (gold) type.
If your mainshaft is of even thickness, and has no washers between the circlip and the outer brake disc, then you require the early (silver) type - please see the photo showing the difference.