The twelve Xt660x 2007 11b1 England 1f11b-300s1 Taillight component parts are all listed in this schematic.
Some items from this specific schematic: Bulb, Tail Light, Lens Taillight, Washer, Plate 8221447500, Grommet (16r).
The sub assemblies and components that make up this Taillight include this Taillight Unit, the most expensive part.