I'm trying to determine the correct style spare wheel, seems to be some conflicting info out there & I'm hoping someone knows the answer & can help me.

On a '70 Charger equipped with 15" x 7" Rallye wheels, would the car have a 15" x 7" Rallye wheel as a spare, or a 15x7 stamped steel wheel?
I know on a 14" road wheel equipped car it would have a 14" steel wheel.

Some are saying 15" Rallye wheel, others are saying 15" steel wheel.
Is it a build date issue perhaps? Can anyone shed some light on this?
Thanks!