| Diagram | Fig. 28 — HEADLAMP AND FLASHER LAMPS · ref 3 |
| Subsystem | electrical |
| Listed in parts books | 1972, 1974 |
Light unit (99-1156)
Lucas headlamp light unit (reflector and lens assembly), catalog number 516801, also listed as 99-1156.
This is a Lucas headlamp light unit, the sealed reflector-and-lens assembly that sits inside the headlamp shell and does the actual work of throwing light down the road. It's listed in the catalog under the number 516801, with the alternate number 99-1156 also tied to this same part.
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The catalog places this light unit in the HEADLAMP AND FLASHER LAMPS section, alongside the broader electrical equipment listings, so it's a straightforward swap-in item once the headlamp shell and rim are off. Catalog entries for this one run 1972 to 1974, so if your bike falls in that range this is worth checking against what's currently in the shell.
If you're replacing a cracked lens, a dim or fogged reflector, or just chasing down a wiring gremlin traced back to the light unit itself, this is the part you're after. Bring in your old one or the number off the back of it if you're not sure which light unit your bike takes.
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