105 10spd levers - D.A. Front Derailleur with a Sram Apex C.Set

[Ajax Bay]

I can personally say that the 11 SPD fd's have a longer arm (where the cable attaches)

But the 11sp DA FD is NOT the one you're trying to drive with the 10sp 105 STIs right? You're trying to drive an FD-7900 (10sp).

 

[winjim]

Your Dura-Ace mech is not compatible with your shifters. Sell it and buy another 105 or Ultegra. There's no need to faff about with anything else. You know it works.

 

[blackgoff]

As per pic. upon a Q. to SRAM via FB