Never heard of it either, love my 09 cab thought! If you like the car and it meets your requirements otherwise buy it and consider the fact that it's unique and perhaps one-of-a-kind. Personally it wouldn't bother me.

 

I'll bet bumperplugs could make something to fit that hole.

 

Couldn't disagree more. You are making mountains out of a molehill. If you plan to drive the car to 50k+ miles, just get the fender welded closed and repainted, or go the below spare fender route if you really think it worthwhile. There will be plenty of buyers that will not be overly concerned if the work is high quality and undetectable. Obviously make sure the shop knows that if it isn't absolutely flawless they will be doing it again. As way of explanation, photos would suffice to most reasonable people that the reason for the work was smoothing the appearance rather then collision damage.

I'm sure you could also remove the antenna and get a plug or a stubby antenna (which i don't think would look great.)

If you are not planing on putting many miles on and want to retain value to hardcore "purists" , a replacement used oe fender and quality paint work should be less than $750 (new oe is $722 which isn't that hurtful either). buy a $50 internal antenna. Remove original fender and antenna and store it carefully. When it comes time to sell, you have every option.