ya ive seen about half a dozen variants of the bumper between the toys and the cartoons. this ones loosely based on the one from the movie, for me it looked the most like what i remembered seeing on him.
the inspiration came from a clip from the movie used in a music video for "machine head" by bush, near the end where primes in vehicle form chasing down a decepticon, as he drives towards the camera. if you havnt seen the video check it out, its cool ! right around the 3:30 mark
http://www.youtube.com/watch?v=v3EGD...eature=related