spare tire originally mounted in the bed of my 72 Cheyenne Super?

[72timemachine]

I have the H shaped bracket on the driver's side in my long bed located just before the rear tire. Can someone tell me if this is in fact where the spare tire was originally located because when I bought the truck it had no spare tire but I did get a bracket at the bone yard which is factory yet is mounted under the bed at the rear.

Thanks for any help.