Here is what I have in my notes:
SWAY BARS:
Front Bars:
ALL '70-'81 T/As & Y96/Y99 equipped Formulas came with 1-1/4" (1.25) front sway bars.
Std. Formulas had 1-1/8" (1.125) bars.
Std. Birds had 15/16" (.938) till 1975, then it increased to 1"
Rear Bar:
1970-72 T/A & Y96/Y99 Birds = 7/8" (.875)
1973-77 T/A & Y96/Y99 Birds = 13/16" (.813)
1978-81 T/A & Y96/Y99 Birds = 5/8" (.625)
1978-81 WS6/WS7 equipped = 3/4" (.750)
Not for sure on the lack of the bigger bar in 1970.
Don't remember a bulletin on it?
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John Wallace - johnta1
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