Thanks everyone for the help and clarification on the new aftermarket parts.
I finally managed to get the grille and moustache fitted but it was a terrible job of fitting machining and cutting .
I ended up making 4mm brass spacers on the lathe that took the already installed rivet nuts from 5mm to 3mm with a 4mm spacing.
This , plus a bit of bending of the moustache and I had it installed flush with the body (2 days later) .
There were a few spots that had to be touched up as I took your advice and masked the area first.
The Grill was a bit easier to fit , although I had to Dremel new slots for where the moustache bolts hit the sides of the grill.
As expected , the older holes did not match on the top screws to I ended up making the existing 5mm previous owner attempts into a 3mm rivet and that worked perfectly.
Everything now lines up .
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