Well after some research and studying all the HURST Shifter Stick charts I came to the realization (which you probably knew already) that GM was too cheap to buy the sticks from HURST and decided to use their own, aka generic ones, at least in the 81-83 era - correct me if I'm wrong
It appears that HURST tags all their sticks with their logo, its a pride thing I guess, kinda cool, well and my stick aint got not HURST written on it, does yours? (run out to the garage and check, we'll hold.... lol)
here are some of the HURST stick charts I consulted
SHIFTER STICKS Steel Sticks Page 40
SHIFTER STICKS Steel Sticks Page 41
same goes for the shift knob, it is also a GM creation, as I do not see any that look like our stock one (with that Overdrive feature) on HURST's website