Black bumper bit on new Elise??!

[RichwiththeS2000]

Just wondering, does anyone know why some of the new Elises have a black rear bumper like this
http://www.pistonheads.com/classifieds/used-cars/l...

And some are colour coded, like this
http://www.pistonheads.com/classifieds/used-cars/l...


Is it to do with a certain 'pack' ??


Thanks!