| Diagram | Fig. 18 — HEADLAMP, SPEEDOMETER, TACHOMETER · ref 38 |
| Subsystem | electrical |
| Listed in parts books | 1971–1974 |
Lens (99-1191)
Amber beehive-style lens for the Lucas L874 turn signal, also cataloged as 99-1191 and later as 60600621.
This is the lens for the Lucas L874 turn signal, the round, ribbed amber lens that's become known as the beehive style. Lucas catalog number 54581638 is the same part carried under the earlier 99-1191 reference and was later renumbered by the factory to 60600621, so if your parts book or an old invoice shows either of those numbers, you're looking at the same lens.
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It shows up in the catalog under the headlamp and flasher lamp listings as well as the battery/indicator group entries, and it's cataloged across appearances from 1971 into 1974. The L874 indicator was a common turn signal unit across a number of British bikes of that era, and this lens is the amber cover that snaps or screws onto the body of that indicator housing.
If you're not sure whether your indicators use the L874 body, pull one off and check the shape and mounting before ordering a replacement lens — the beehive profile is distinctive but there were other indicator styles in use around the same years.
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