Originally Posted by JesseT
I just bought all the caps a while ago from Ford. The original ones are no longer available, but I was advised to get 90 spec S2 rear wing caps and indeed they are the correct diameter. The downside is that they don't snap in, but instead need to be installed with some kind of adhesive.
thanks for your advice JESSE T, gave the 90 spec caps a try and they look as they will fit