1980-1984 CT110. 1974-1978 XL100. It is Genuine OEM Honda and the part number is 38300-GF0-405. Do your research before buying. 1974-1976 MT250. 1974-1976 MT125. 1981-1983 PA50ii. 1980-1983 XL80S.
After receiving, noticed that one of the terminals was loose, the one that connects to the resistor which actuates the coil. Rather than return, I simply super glued the terminal where it went through the base and that worked perfectly. After solving that matter, I closely scrutinized the entire unit (obviously with the cover off) and would say it's mediocre in quality. But it does work and does come with two OE style rubber mounts. Also note, this will not work with any bulbs except the proper wattage spec'd out by the OEM. I actually ordered the Honda 6 volt bulbs, they're 4 bucks a pop but NAPA has the 1129 bulb which is exactly the same 6 volt, 17 watt bulb. So keep that in mind. For the price of this unit, it's ok. Just ok.
Restoring my first bike and being able to find parts that fit a 1971 is great, but having ones that work is even better! Plugged right in and the rubber mounting bracket was perfect as well!