This one is already up for discussion in the "general discussion" section.
It has the wrong front bumper. The battery cable is wrong from the battery to the junction block. It has plastic wire loom cover on the harness going across the firewall. The voltage regulator is not an AC Delco. Just a few minor points to mention. It does appear to be a GS, but further and closer examination would be necessary to be certain.
I do question the 24,000 actual miles with all the obvious things.
Loren