The "new gen" wing is what was offered on the '05 Quad Cabs (like yours) with the factory tonneau cover, and the '06 (all models, because they ALL came with the factory cover). It has a center post for support and is a little bigger. The new wing "swoops" a little more than the older one. I think it's a better looking wing. :rock:
Your tonneau cover looks to be wide enough to mount a factory wing (either style).... WIFEY had her husband measure the wing she has to give you the width you would need to mount it. She said it was 65 1/2 inches wide. I would measure your cover and see if that would fit or not. ..... That would be the same size as the newer (better looking) wing, and it would fit if you have the room.
Here is a pic of my truck with the factory NEW GEN wing. It will give you a good idea of what it looks like.
.... Sorry...
My foot slipped on that last one.