I'm fitting a CK-7W bluetooth handsfree kit to the car and would like to know which lead.

I have searched around and found an autoleads 06-122B which is a direct fit between CD70 and Kit, I have to pick up a switched feed from the ciggy lighter.

But there is some suggestion that on a navi unit I have to fit a filter autolead 06-212B, is this correct?

PS Vectra Estate 1.9 CDTI SRi 150 on a 57 plate

Any should do's, would do's, shouldn't do's would be appreciated