I have 7 red and 4 amber Bargman LED up grade butterfly kits.. I had used them on my SOB , and they work GREAT , but the RW has different marker fixtures..
All you do is remove the OLD style marker cover , pull out the old bulb , plug in the adapter and press the new cover on.. AND you now have LED markers . .
FREE to a good home , maybe someone with an older style utility trailer , or something>?? pics below -