I thought it was supposed to be Oem plastic rivets same as the ones used on the top
Ok looking at the 240Z list again, the part list has 8 plastic rivets (79909-E4100) and you only need 6 for the top edge so the numberplate panel must be where the other 2 go.
I think it should go over. Mine did look a bit beaten up back when I took that photo.Paul, I might be wrong but I don't thing the top lip of the centre panel goes above the rear panel like that - it should go below which is why it looks stretched.
As per earlier post, I agree with the self tappers, this is what mine had, but this is what makes it all work... they clip over the little bracket