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Okay folks this is what my 1991 FSM says on page RA-14 under Service Data and Specifications.....
Stabilizer Bar:
SR20: 15 mm
GA16DE (except STD models): 10 mm
See the "except STD models" note, STD=standard. This leads me to believe that the '91 E (standard model) did not have a rear sway bar from the factory.
My 1992 FSM says the exact same thing on page RA-13.