I have dual headlights on my CBR, and one of the low beams burnt out. I used my brights all winter, but I want to ride at night now. Today I put in regular 55/60 watt bulbs, to replace the Honda 45/45 bulbs. I had to cut off the two lower locating tabs on the new bulbs. I used the adaptor to install them, but I don't think it's necessary. Once you put the top locating tab in the socket hole, it can't rotate, and the retainer spring holds it in place. With my dashboard, it was a bear to get to, even after I took off part of the fairing and instrument panel. But it works great now.