Help me choose gas cap!

[Ripper]

I'm currently looking for a gas cap for my Firebird -74 but I have a hard time to decide...
The reason I'm replacing the one behind the licence plate is because the ATL cell sits higher than the stock tank. Therefore I need to place something on the quarter panel or in the lid (like the porsche below)
https://static1.pt-content.com/images/pt/2012/03/porsche_356_slcoupe_s_50_07-1.jpg

A nice example on cap installed on the fender is this Camaro;
https://static1.pt-content.com/images/pt/2012/03/Dale_Earnhardt_Jr___s_Camaro_by_DetroitD-1.jpg

No matter what cap I decide to go with, it'll be recessed into the body

What I would really really like to have would be this kind of cap, however dry break systems are quite hard to use on street cars. lol
https://static1.pt-content.com/images/noimg.gif
https://static1.pt-content.com/images/pt/2012/03/gas2Bcap-1.jpg


So... what should I choose of the ones below?

1: A plain air tank cap. I'm allergic to the ones with visible fasterners so this is the one...
https://static1.pt-content.com/images/pt/2012/03/0528667JPG-1.jpg

2: I know it's 60s... It looks good, but I think my car will be considered too "new" to make it fit nicely... Maybe I'm wrong though
https://static1.pt-content.com/images/noimg.gif

3: Same manufacturor as the nascar dry break system above. As close to a dry break system as I'll probably can come in looks;
https://static1.pt-content.com/images/pt/2012/03/rNmZR-1.jpg

[Ripper]

And this is the car; https://www.pro-touring.com/showthread.php?67239-The-unorthodox-budget-Firebird-(-74)

[Olav]

From a Honda MC from the 90's. If you go to a MC breaker you can get a damaged tank with mounting flange that you can cut out.

http://www.wemoto.com/parts/picture/HL-749575/

Olav

[69stang]

I recently picked up these locking aircraft caps on ebay for a decent price. New ones sell for about $160 each, got them both for about half that. Have to make a receptacle but I already have something figured out.

[Ripper]

Roger; Nice caps, specially the text around them is really cool. Guess you'll keep that?

Olav; Yeah, I know. However, I'm looking after something without the visible fasteners...

The ones who voted seems to like the third option. I like that too... I think.