gaz tank cap

hello guys!
here is my question:
i have that nice gaz tank cap, but i can't put it on because the back is missing:





is there a place to buy the back?
an adaptor?
how do you fix it? (there is no holes for screws to go in)
thanks!

 

is it a ...grille emblem...

 

is it? or it is?

that would explain a lot
i'm gonna keep it just in case I convert my car to a first generation grill.
(which i'd like to do... but not now... i'm already busy with other things)

but that means i need to find a gaz cap...
let's go to the "parts wanted"

 

yup, grille medallion that's missing the back (common thing)

 

it WOULD look nice as a gas cap though

 

well, it does exist as a gas cap too...
it's called the deluxe gas cap

 

I have often thought about trying to combined a wornout/faded standard gas cap and a grill medallion to make a deluxe gas cap. Just never gotten around to buying the two peices to try it yet