Okay I managed to get hold of an s3 bumper off a guy local on eBay . Bought bootlid and spoiler off him. Offered me an s3 bumper for 100. Couldn't say no. But I got it home an had a closer look. It's all intact other than where the bumper meets the arch. Here's a pic of my sline bumper corner to see te difference
Now I'm guessing this bumper may have been stolen as I don't see any other reason as to why the arch brackets would be completely gone. But how would I repair this? I'm a sprayer not a repair specialist but I'll give it a go.