Before you go and buy one of the expensive fuel caps that are available out there, consider this. On the left is the cover from one of these, on the right is an original cover. Notice the left one the door is attached via a punched pin, the original uses a screw. The one on the left fell apart when I took it out of the box, fixing it is near impossible, it was not cheap. I think I am going to have to have the original chromed instead, non-glare chrome.
Cheers