My 72' C10 SPID Window RPO Option #

[samkost]

I sure do learn a lot from you guys here about our rigs.
Well I'm getting excited and close for my body work/paint on my 72 C10.
I'm in the process of deconstruction, bagging/labeling and ordering more parts that I still need for completing the final assembly.
I currently have a rear slider window which I believe is not factory, maybe dealer installed or after market by P.O. (not on my SPID) that I will be replacing with a solid back window.
My questions are about tinted (light green tint) and non tinted (clear) window glass.
My SPID shows that I have tinted windows (code A11) with the factory 4 season air conditioning, but all my windows are not tinted.
Is it true that all GM cars and trucks with factory air came with tinted windows?
I was told you can always tell an air conditioned GM vehicle because they always have tinted windows. Yes?, No?

An informative link I stumbled upon about the 1967 to 1972 C10 SPID's option codes. http://outintheshop.com/options.html
On this site it shows the following for glass options:
A02 : TINTED WINDSHIELD
A03 : TINTED SIDE WINDOWS
A08 : RH SIDE BODY GLASS
A09 : SIDE DOOR WINDOW GLASS
A10 : PANORAMIC CAB
A11 : TINTED GLASS
The A11 on my SPID is the only code pertaining to the glass.
Previous owners may have contributed to changes from the original glass?

Thanks again for any explanations.
Sam