The front grille is too wide (top to bottom) by at least 3/8" to fit into the opening. Our USDM car really is significantly different in the front, probably due to the crash bar, which is important given how most Americans drive, ah, I mean text and drive.
Zunsport offered to refund the cost if I ship back to them, which is not the best solution as I need to find a suitable box and ship to the UK. Their quote to my original enquiry was: "I?m sure our Grilles will fit..." Not.
So I did manage to fit the lower front which works fine, and wish the upper would fit as it is both stronger and much lighter than the OEM. However, I don't see any way. Btw, our grille is held in place by a 2+" flange around the outside which does require removing the bumper to access.