I'd say I'm pretty much convinced on the factory glass being for HJ-X-Z-WB and it being as Rodney and Sean's Van show.
HQ on the other hand I'm still to be convinced. Nothing pre HQ had factory side glass. Even though Byron suggests the part numbers are HK-T-G era I'd suggest these numbers were "spares" for when such occasions arose. This happened quite a bit with Holden (more so with accessories). Potentially the side glass "might" have been earmarked for introduction with the boat anchor model I.E: HK-T-G but seeing as it failed to make the parts manuals for these or even HQ it has doubt. These at this time were still being outsourced to the aftermarket and thus varied in type, brand and style in each state.