This is a daft question but I want to make sure I'm right before I go to the auto store, obviously my car doesn't have air con so I assume I order a non air con aux belt, only reason I ask as I was sure if it would of made a difference if the car had had air con fitted before it was removed from the donor car.

if you currently have a belt on the car, look for a part number printed on the belt.
This usually consists of the size of the belt in mm.

It will be considerably different to the standard belt for a zetec that is in a mondeo/focus etc.

[Edited on 6/8/14 by pekwah1]

measure the length using a piece of string around pulleys then measure with tape then go to camskill website and find correct length a 6 rib belt is a 6pk

Hafords have a lot, go and have a look. As said measure it and they will have one.