I've got air vents units like the picture below and have just notice the black part which can be taken off is missing from one. Now i've noticed it its bugging me, does anyone know where i could get one from off the internet or if i would need to go into a ford dealer?

Don't know what you mean. It's all black !

http://pages.ebay.com/link/?nav=item.view&id=321424080230&alt=web

The patterned surround on the vent simply unclips to swap over.

If the vents are attached anything like the focus there will be a couple of tabs to lever down and accessible from between the vent fins.

Just checked a couple of Fiesta forums and the vents pull out with a little persuasion from a screwdriver with some tape on the blade to avoid scratches.

Are you referring to the tab in the middle of the vent?I have the same thing on my mondeo, 2 of the vents have them missing and I would quite like to find them as well.

I'll check Microcat in the morning to see if the tabs are sold separately.

Yeah the tab in the middle, sorry didn't really make myself clear i weren't really sure what to call it.

Indeed.

I figured that was the piece.

I'll check for you and Jeebs in the morning as promised.

According to Microcat the vents come as a whole unit, the plastic tabs are not sold separately, however I have located replacements on ebay for you both-

For James-

http://www.ebay.co.uk/itm/Genuine-Ford-Mondeo-MK4-2007-Onwards-S-Max-fiesta-Air-Vent-Louvre-/151318631668?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item233b4b14f4

For Emma-

http://www.ebay.co.uk/itm/Ford-fiesta-st-outer-dash-airvent-vent-2006-2007-2008-face-lift-dash-/321424080230?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Car+Make%3AFord|Model%3AFiesta&hash=item4ad65e3d66

Muchos Gratitudos Clive :)