Hi Andy,
From your pics it looks like you have a bit missing.
The metal part on the side of the radiator should have a rubber block on the front. This presses against the inside of the bonnet and should ensure the panel doesn't vibrate.
The two small blocks should sit firmly on the valence panel and ensure the grill sits level. I guess this is to mitigate the effect of the bonnet warping on the ZA, because the prop mechanism only acts on one side of the bonnet.
Attached is a pic of my car with the block and the mark where the small rubber sits.
Paddy