Idea for antenna hole plug

I've been looking for a good solution to delete my antenna yet ensure that it can be reinstalled later in case a future owner so chooses. The antenna in my car is essentially decorative with the side benefit of allowing water to leak into the trunk and cause a bit of a rust problem.

I've found someone who's willing to make a custom machined plug that looks decent. I looked at many other terrible solutions and this one is actually nice. See picture below. I don't have a price yet, but if anyone else is interested in having one made let me know. The more I have made the better.

I need one piece of info. Can anyone tell me the diameter of the hole for the antenna? And also whether it is standard across all 308s?
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Interesting. Thanks for the link! I'm amazed that I didn't come across this site when I searched many different way for plugs a few weeks back.

I like the idea of a colour match with the paint. However I think I can do that myself with the aluminium machined version. What I prefer about the machined version is the ability to seal the hole in the body with an o-ring on the inside and outside, and the fact that it can't be popped out by some random person like the bumper plug product can.