621 code on PHS
I don't know if this helps or not, but,
My 69 GTO RA III Vert PHS shows:
SPG SHKS R/H 4.21 621
REC LINE SEAT 42.13 578 (or could be 576, blury)
Yes there is a space in the word recline, typo?
PHS Dates are 4/17/69 & 5/15/69, dealer Royal Pontiac.
It has headrests and 1968 style release buttons on the side, not the back of seat.
Headrest are not listed separately on the PHS. I assume because it was after January 1st 1969 manufacture/delivery dates.
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