CM NR200P front header issue

[Gill]

Hi all. 
I’m building me PC and I stumbled upon a problem. 

The the case doesn’t seem to have HDD activity LED wiring for the MB. 

In addition, the front header cables came organised with the bracket for easier connection on the MB but it contradicts the MB manual. 
What I mean is that on the wire terminal there is a little arrow that is the +  but the way it is arranged in the little bracket seems opposite than what the MB manual suggests. 

I hope I was able to explain myself.
 

I’m a bit confused. Should I take the cables out of the bracket and wire it manually?

Is it normal to not have HDD activity led?
Appreciate any help.