At 26 inches MTB course I had to build a mount because some wheels not have otherwise except tires saddle and handlebars.
On 28 inch trekking I needed only degrade the old taillight and installing the new LED taillight.
This I have but additionally mounted a surge protector I had the existing screws, through longer, replaced.
The rear light is working properly and the side lights as well.
It is highly visible, even in daylight.