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is it possible to fit the zetec s rear diffuser to a normal zetec? if so how easy is it?

I did it, it's not too hard. On the zetec s there are tabs cut into the bumper where the top of the corner caps slot into, non zs bumpers don't have those, so the tabs on the caps need to be filed off and instead just bond the corner caps directly onto the bumper. Then the diffuser just fits onto that being held in place by the spacers underneath. I used thread locking nuts so that it can't be stolen easily. Hope this helps.