Batboy
Enthusiast
Here are the lights I found. I emailed them to find out the size but they have not replied. They are listed with the clearence lights for trailers, so I'm guessing they are at least close to the correct size. Might be worth buying a pair just to see. Anyone else want to give it a try feel free.
http://www.vehiclelight.com/1275rc.html
http://www.vehiclelight.com/1275rc.html