I put the Optronics LEDs on my BassCat trailer last year and they are da bomb!
Also replaced the amber and red side marker lamps with Optronics LED's.
Got mine from
http://www.easternmarine.comFor the tailights, I ordered the light without the rubber grommet and wire connector, as I re-used the rubber grommets and wire connectors from my existing incandescent tailight assemblys. Saves you about $7.00 per light.
Amber LED clearance #1294124
Red LED clearance #1294125
Red LED tailight (red lens) #1294141
Red LED tailight (clear lens) #1294146
Good luck!