No I've mocked it up, and it's 100x better than the Canadian section. Very much OEM part and fitment. But... I may have found a good rear valance section (off a donor car) and given I'm restoring an early car, I am thinking of using that. I may hold onto the sections I fabricated and made for spares in future. So it's not a total loss.
Andy in the UK is pretty good, so you should have no issues ordering through him (other than time to get it out to you).