Try our re-instated info resource - "Aladdin's Cave" (Main menu)- sorry it's taken so long to fix
Why not just use the USA mounting bracket?
Does this one fit?www.ebay.co.uk/itm/365382466765
I have just done similar, just need to drill a middle hole in the lower part of the UK tail light bracket.
So looking from the rear, with uk mudguard and tail light bracket you'll see a bit of mudguard showing at the bottom of the number plate, with the US one you won't unless you swap out that big yellow air brake for something a bit smaller.
Well if you do find one and want it from a salvage yard etc, let me know then you can have it shipped to me and I’ll bob it in my suitcase for you and drag it back. It might not be a priority but while I’m here and all that???