Those are the sizes of the left and right one....there is also one in the middle that repeats size 1x71........
You can make one that is 828x71 and we will split it where appropriate. Just make sure there is 1 pixel of horizontal uniform so it can be repeated no matter what size screen people use. It can be at left, right, or center, but I prefer them in the center :)

 

How about one with flashing lights, like the one on CobaltSS.net?

With an SS... of course.