The CX chassis doesn't have an option of overriders or full bumpers. I don't know why, but MMC have been 'cleaning up the lines' (think of the multi-functional front and rear lights, rather than, for example, separate indicators) for the last few years. If you need them I'd ask one of the dealers if they can retrofit a set of overriders. Williams said to me that they should be able to do it when I first looked at a Plus Four, but now I prefer the 'clean lines'.