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Twenty20 H4 Compact.
Where can I purchase one. Hershey
The"165931209558" LED bulb you bought that fits your reflector is BPF.
![www.ebay.com](https://i.ebayimg.com/images/g/v2AAAOSw-ftj5UlO/s-l400.jpg)
LED HEADLIGHT BULB for British Prefocus 12v 60/55w TRIUMPH BSA NORTON MATCHLESS | eBay
It is a 12v-20volt dual function (high & low beam) DC bulb. It is non-polarity so there's no rewiring or modification needed to your machine.This bulb fits directly into your headlight and plugs into your harness.
www.ebay.com
A "Twenty20 H4 Compact" appears to be H4 (p43t) so it's not the same bulb/reflector type.