Somewhat old post, but I just managed to find my way back here with all the changes.
As far as LED conversion, I'm skipping the aftermarket and going straight to hacks. Some minor soldering and modification of the light fixtures and basic LED modules and 10mm LED will do the job nicely.
http://www.oznium.com/led-modulesThose modules will work nicely. I'm using the rounds for markers/signals, and the straight units for tail/brake. I bought some plain 10mm superbright LED with 40ohm resistors to replace the backup lights. They also sell SMLED chip units for replacing dome lights, but I'm still working out how to modify the silly little lens my 1st Gen truck uses so I can fit one.
When I get to doing the re-fit, I'll post pics in my build thread in the 4x4 section (though I'll likely wait til the boards migrate properly).