77W/LR Vortex Generators

Hi guys, out of interest, should the T7 777-300 include vortex generators on the flaps or is this a unique feature on certain aircraft? I've noticed that they do exist in the bump maps and textures but not on the physical wing model. I don't have any example images from the PMDG T7 but loading it up, setting Flaps to 30 and then comparing with the linked picture below and they are quite a prominent feature of the 77W wing. I had a look at the real -200 and they are absent so this seems to be a feature unique to the 77W and LR which distinguishes the wing a lot from the older series.

http://www.airliners.net/photo/V-Australia/Boeing-777-3ZG-ER/1753971/L/

http://www.vortex-generators.com/vortex-generators.html

Cheers!