Attached is an advanced list of Motorsport Parts available and to be available for the GT. The part-nos. will assist you even though some are on back order.
They're also in the process of attaching a link on the Ford Racing Parts website specifically for the Ford GT.
I looked at the picture and it appears that the "cap" is actually just a cover for the plastic underneath. Is this correct ? One would think that an actual real billet cap would be preferred...