How do we know any of this?

Chrysler — broadcast sheets, fender tags, plant overlays · 5

• What changed about Mopar paint codes in 1969?

  Two-character codes became three; the model-year letter prefix shows up.

• What is a broadcast sheet?

  The form that traveled with the car down the line.

• Who is Galen Govier and where do his production numbers come from?

  The reference for Mopar production figures, and what 'registry-attested' means.

• Why are Lynch Road tags different from St. Louis tags?

  Plant clerical practices vary, and Lynch Road famously omits A34 callouts.

• Why was the broadcast sheet stuffed in a seat spring?

  Because line workers had to put it somewhere.

GM — SPID labels, RPO codes · 2

• What is a SPID label, and where does it live?

  The sticker that survived, or didn't.

• What is an RPO code, and why does GM have both three- and four-character codes?

  Regular Production Options, the GM equivalent of broadcast cells.

Restoration & documentation · 1

• What does 'numbers matching' actually mean?

  A loose phrase tightened.