Is this for aestetics or does it have a functional purpose?
I have a FD-5801 on one of my bikes and this top tab with the cable running through it won't snap into the top of the derailleur (I'm sure it's something I broke). Does it have any functional purpose other than to tidy up the cable? I don't have bad shifting and the cable doesn't hit the crank so I'm not too worried about it unless there's something I'm missing.