I think I understand the taping into the brake light part, but I don't understand how you get the lights to stay in the reflector holes. I got the round LED lights, the rubber grommets, and the special little connector to hook into the back of the LED's. Do the lights just friction fit into the holes with the rubber grommets? There's no bolt, or anything else, on the back of the LED's except the adapter connection and I'm a little confused.

Any help would be appreciated.