Looking in the service manual on the job description for rear sway bar removal.
They have 3 sway bars listed.

sway bar 123 326 44 65 13mm diameter bushing 123 326 20 81
sway bar 123 326 45 65 13mm diameter bushing 123 326 20 81
sway bar 123 326 46 65 15mm diameter bushing 123 326 21 81

Since the last sway bar is for "special vehicles and special T sedans this sway bar is not typically used.

Also since my old bushing is the 123 326 20 81, it is for a 13mm diameter sway bar. Which is what is shown in the manual for sedans too.
Measure your sway bar. If it is 13mm then this bushing is the replacement for the 123 sedan (300D, 240D) also.

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car