Well, this actually is the 1st of 2 bonus items on his auction, however wanted to share them with you guys.
here's the original thread:
http://www.cybertron.ca/boards/showthread.php?t=16453
They are removable (yay!!!!) and attach with 2 SETS of rare earth magnets. The batteries are replaceable and red 5mm LEDs. I removed the factory paints and applied what I thought was more "movie accurate" (what a stupid term, and after seeing the movie, I am leaning towards "less movie accurate" lol) not 100% happy with the placement, but with all the articulation the forearm has, I don't think the side which they are on really matters (his hands can rotate)
Anyway....