Yep that's the 'diffuser' section of the bumper, but it can't be detached from the rest of the bumper i.e. the rear bumper is all one unit. So you'd be best off looking for a complete rear bumper.
If you're UK-based, I'd just recommend keeping an eye out at vehicle breakers. Synetiq are quite good for parts -
https://www.synetiq.co.uk/breaking-vehicles/#
Hope that helps.
Yea that's also who I was going to suggest.
Had an offer on one I was looking at on eBay but that ones in the wrong colour for mine and I don't really have any funds left for improving the exterior looks ATM..
It was about 50 ish with postage.
That is a decent price if you really need the part. Just having to paint it kills any saving unless you can do it yourself.
Synetiq will have a cleaner one if your willing to wait for the right one.
Also something I forgot to mention. You can buy after market diffusers. So if you know how to fix one to the one you already have. Picking the right shape you could possibly get the standard rear bumper to look similar.
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