69 camaro rs/ss wheels

[enio45]

Im working on a car for my customer who wants put put the SS wheels on his 69 RS SS car 350/300hp - auto  - car is dated 12C. 

What wheel and tire size would be orig to the car for the SPARE TIRE with the SS wheels?

Can i get a space saver tire as an option?

Appreciate the advise..... 

[KurtS]

Spare would be the same as the wheels and tires.
N65 was an option.