I purchased the 9 LED feestoon lights from Super Bright Leds
http://www.superbrightleds.com/festoon.html
There is a little indent where you need to pry a small screwdriver to remove the covers.
You have to put the light in on a slight angle do to the tight area it is contained. make sure you did not reverse the direction before replacing the lens.
The right is the old 4 LED festoon bulb which I felt was not bright enough.
The left is the 9 LED bulb.
Close up of the front of the LED bulb.
Close up of the back of the LED bulb.
Picture showing both lights.
test the lights and replace the lens.
The rear light has two spots to remove the lens cover and it took a little work to remove it.