Just a thought about these space savers I have the one that was in my car when I bought it I think the can of air is empty but you wouldn't want to inflate it because of it's age it could be dangerous I guess it is just for car shows? I have removed mine and put a normal spare wheel in there in case I have to deal with a flat tyre.
It's just for show . It's 47 years old I wouldn't think of blowing it up
does anybody know of someone that reproduces them .
I bet there is a market for them .