It was from here:
https://www.futuredesignusa.com/g30-5-series
But I got hit with import tax (which I just forgot about when adding it up) of £230! and shipping to UK is $200, it ends up close to OEM after that. If I had the option to do it again, I would go OEM.
Main motivation for getting this one was 1) price (but I hadn't accounted for tax) and 2) the bumper trim is gloss black whereas with OEM its just raw matte plastic and would need painting gloss black (or any colour you prefer I guess).