My 68 Chevy C10 SPID lists only a chrome front bumper. Factory rear bumper delete?

[HeavyHauler]

The SPID for my 1968 Chevy C10 only lists a front chrome bumper and does not mention the rear bumper at all.

Does that mean it didnt come with a rear bumper from the factory?. There is a bumper on it now but it does not look anything like the chrome rear bumpers, but maybe it was dealer installed? The bumper is a thick steel bumper with location for a tow hitch and the bumper has a square look to it kind of like some of the Westin brand aftermarket bumpers you still see today being sold.