Apart from the head topic, imho the bonnet mouth is of the later bonnet version and not the slightly smaller early welded louvres (incl OBL) bonnet mouth. So I assume, they simply took a later bonnet and converted it to the early one.
Btw: same with 885018.
This implies the next question; which louvres and flanges did they use?! All louvres repros offered are to my knowledge not correct and have the wrong profile. I have one of the lastest repro sets lying next to some original louvres.
Issue with mouth (and with louvres / flanges as well) is: if it needs correction, you always have to repaint at least the bonnet, if not the whole car. And if you go for a complete repaint, it is almost the whole hog again.
Here is a pic of a believed to be original early bonnet / mouth:
versus:
