Needing spid info on my new 71 gmc 2500

[Ozark Tim]

I bought a cool 71 gmc 2500 from josh here on the boars
The truck was built 2-71 and the spid shows the following options
Z84 custom sport truck and
Z17 Sierra Grande Custom
I'm assuming this was a precursor to YE9 as the trucks decor is like a Sierra yet it has rear fender Sierra Grande emblems and above the door handles it has the Custom emblem like the ones used on custom campers, but no camper emblem.
It's very original and was just curious about what seems odd to me on the decor package.
Any gmc experts out there that can chime in to confirm my suspicion.
Thx
Tim