Hi, I am looking to put a zetec s rear diffuser and boot lid/spoiler on my 2010 titanium. I don’t know how simple is it though, mine is a 5 door and I’ve had some people I’ve looked to buy from say the spoiler won’t fit if it’s from a 3 door as the shape is slightly different but some have said it will fit both. Everyone ive asked so far have said the rear diffuser will be fine but thought I’d check with that. Thanks 🙂

Spoilers fit, the boot lid is exactly the same, your fiesta is know as a mk7, a mk7 zested s diffuser will fit, a mk7.5 diffuser will but, you need the bumper side trims from too, as they are a different shape between the 2 model years. Side skirts are different between the 3 and 5 door cars.

Thanks, and with the rear diffuser, would I be able to fit a newer zetec s diffuser or st diffuser?

Yes you can, as long as you fit the side trims for the same model.

Are the side trims the bits that go next to the diffuser either side at the bottom of the back? And why do these need to be fitted as well instead of just the diffuser alone?

Yes they are, if you don’t fit them there will be gaps and it won’t look right.

Nice one, appreciate the help 💪🏽