[jocko]

An original orange 72 can be either "orange" code 516 or "red-orange" code 524.
516 is also known as Tangier Orange / 524 is also known as Hugger Orange.
Your first link looks more like code 516.
Note, the SPID code may be different if it was a two tone truck that had orange as the primary color, but the code for "just" the orange part is 516 or 524.
For example, in 72,
516 with white roof = 546
516 with white roof and middle = 483 (1st pic below)
524 with white roof = 553
524 with white roof and middle = 458 (2nd pic below)

Medium bronze is code 522, but doesn't look anything like your first link. It's much more of a brown than an orange.
516 (pri color), 524 (pri color), and 522 (pri color) shown in order below.

Can you post a pic of the bed of your truck? The 2nd link you shared just goes to a big google search.