I finally finished my tag lights. They were a little labor intensive with manual hand tools only to work with.
I first removed the light assembly and then the clip on plate. I then cut a metal plate to sit in the light assembly from 20 gau. galv. steel. Filed it down to pit nicely. Drilled 2 holes for the holders to sit in. Then I painted the clip on plate, the plate I made with the holders in it, and the assembly.
The lights I used were 6000 mcd 35 degree viewing angle 4 volts and 20 millamps each. I used a 220 ohm resistor and the 2 lights in series and then soldered the wires to the assembly original clips for the original bulb. I put it all together and siliconed under the plate to hold it in and seal it.
They are brighter than the pictures. The camera don't take very good night shots.