Seeking edgucation about factory installation of carpet

[71CHEVYSHORTBED402]

I'm asking about the 71-72 years, but feel free to educate on 67-72, thank you.

It's my understanding the 71-72 Custom (Z60) and Custom Deluxe (Z62) came standard with a floor mat, and I would guess these took the fiber board fuel tank cover.

And Cheyenne (Z84) and Super (YE9) came standard with carpet. Not positive on the tank cover for these, my Fremont Super only had fiber insulation wrapped over it, perhaps something was changed. Apparently carpet insulation was common in these, not positive.

Was carpet an option for Z60 and/or Z62?

Z84 and YE9 got pedal trim, you figure that was because the floor was carpeted? In other terms, would the factory have installed the pedal trim if Z60 or Z62 was carpeted? I don't assume pedal trim was called out as build/spid option, not sure.