In 69 the use of those seals is related not to A/C itself but HD cooling which was included with the A/C option (HD cooling doesn't appear on the PHS since its included in the AC option). They would also be present in cars equipped with a RA IV or any car ordered with 3.90 or higher axle ratio where HD cooling was not included but was a mandatory option (therefore HD cooling shows on the PHS). And lastly any car not in the above list could always be ordered with HD cooling as a stand alone option.
All of the above is clearly documented for 69 and while I don't have as much 70 literature I've never seen anything that would indicate a change in this pattern for 70.
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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