Man, you're just everywhere eh, TPyke? Welcome to CPF--glad you found your way over here, I was going to recommend joining after your last email.
Bill--are you talking about the fluting when you say scallops? Because the original X5 has a fluted body and just to be a little more specific, the twist on/off was the head unlike the later models. The original X5 has been discontinued for awhile now. I believe the earlier X5T's had very slight differences in body style than the newer models, but they were only cosmetic and I can't remember what they were.
Also, the X5 came in only white and blue LEDs, the X5T comes in white, blue, green, red (I think) and UV, and the X5THA is put out by CountyComm and I believe only comes with white LEDs.
The X5 and X5T were/are both available in either silver or black body styles.