How much time should glass and body parts predate

[rsatz28]

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Martin, My car was built in the 2nd week on the Van Nuys line.
Mark, Does that mean that my car wouldnt have had the Astro Glass in it if it was built in the 2nd week of Jan?

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Per CRG's 67-69 Glass Research Report:
http://www.camaros.org/glass.shtml
The Astro-Ventilation logo was dropped from the 1968 door glass after Nov '67 (approximately) production. However, one pane of apparently original May '68 door glass with the Astro-Ventilation logo has been observed in a 05C build. The mating glass on the opposite side of the vehicle is Sep '67 Astro-Ventilation glass, and combined with the other dates seen in the set, CRG believes that the May '68 pane had the Astro-Ventilation logo added by LOF to create a matching set, presumably to fill a void in production and/or to use up left-over panes. Of course this conclusion is speculative, but we will continue to watch for other, similar, indications