The price $26.50) for the LED's for the bullet tail lights is the same as your everyday Car Show price.
You can usually get the regular stop/tail light LED's for about $30.00 ea at car shows.
All I have seen are 12 volt but that is all I was looking for.
Also look at this website
www.mastlight.com they have bulbs for boats but they are the same as cars an 1157 is an 1157 nomater where you put it or what you put it in.
