Those are nice. Did you have to modify the OEM'* or can you find those somewhere?

Tear them apart and just buy some led'* to put inside. Pretty simple actually.

A lot of people get the removable ones from GTS but I don't know or think that they make them for the Bonneville.

I believe theres a whole write up on this here on the forum. but yeah it basically means taking apart the headlight assembly and removing the reflectors. Don't be scared, everything goes back together nicely if you do it right.