Lots of these illogical restrictions back then. For example in 69 you couldn't get both power flow ventilation and reverb rear speaker. The only possible reason I can see is that they both used the right accessory switch position (there are three positions). Of course you could just put one or the other in either of the other two positions but I guess this would have made for complex install instructions on the assembly line in case such a car also had other accessory switches. In 69 it was power antenna in left position, power top or power tailgate window in center or rear defog in center position (no conflicts here since one was convertible only, one was coupe and sedan only and one was wagon only) and power flow or reverb in right position.
The GP only used two positions since a power antenna wasn't offered and the Firebird used a vertical stack instead or horizontal.
Some Examples that cover 5 of the possible six switches in 69 (the GP used a lighted rear defroster switch rather than the regular rear defogger),
a LeMans 4 door with antenna, defog and reverb
a Catalina ragtop with antenna and top
a Firebird ragtop with antenna and power flow
a Bonnie wagon with antenna and tailgate window
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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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