The E60-15's were introduced in 1970. As such, the tires carried the elevated size. To my knowledge, the E60 was never in a NS (no size) configuration.

The e60 was also found on the Rebel Machine. The only other car (that I know of) to use that size, other than Mopar.

Snarl softly and carry a BIG stick 1969 Hurst/Olds Pure Stock 13.23@ 103.1 and the a/c blows cold! Rusty Small