Black Octagon gas cap made from fiberglass for the Star Stryker

I bought this item from the group buy and i must be honest i'am not to keen on the magnet mounting idea so i have 2 questions first is this what other people use or do you use another way to mount it.
Also i know there is a chrome ring that guys are using how are you mounting that one and can you provide the link to it. I know its cheap but i think the chrome provides a nice contras.