good discussion here regarding the brake duct deflectors:
http://www.camaro5.com/forums/showthread.php?t=505806
My OCD was not comfortable with zip ties holding the deflectors in place, so I decided to try to use the 6th gen arms. They are aluminum, much lighter and about an inch shorter (will increase caster)...........both good things. They did need to be modified slightly in order to fit. The piviot bolt hole was smaller than the 5th gen bolt and the bushing was narrower. A 9/16 bit and drill press opened up the hole, I used 3 steps to get the hole opened up to keep it straight, using bits I had (12.5mm --> 13mm --> 9/16). Then made spacers for each side of the bushing, I kept them the same OD as the aluminum center section.
Since the 6th gen arms are shorter, I made plates to lock the pivot bolt in place.
The 6th gen SS cars come with front brake duct deflectors installed, some if not all come with a "track" deflector kit in the trunk.
Part numbers for the 6th gen radius arms: FE4 (SS 1LE): 84051641 (L), 84051642 (R)
I went ahead and got new ball joint lock nuts too (11516382)
Street deflector numbers: 23383583 & 23383584
"track deflector kit": 84145204
Deflector mounting bolts: 11589012