Here is a how-to on BMW E90 E91 E92 E93 E82 F80 F82 E84 lower inner control arm bushing replacement.
Does Your bimmer has too much negative camber in the rear? These bushings may be the reason why.

Proper bushing removal tool is needed - I saw a few places selling this bushing-specific tool for around $200 or so.

BMW calls it Rubber mount, roll-over strut with P/N 33326770829

Cars with this P/N bushing:
1' E81   (02/2006 — 12/2011)
1' E87   (02/2003 — 02/2007)
1' E87 LCI   (01/2006 — 06/2011)
1' E88   (11/2006 — 10/2013)
1' E82   (11/2006 — 10/2013)
2' F87 M2   (11/2014 — 06/2017)
2' F87 M2 LCI   (09/2016 — 12/2019)
3' E90   (02/2004 — 09/2008)
3' E90 LCI   (07/2007 — 02/2012)
3' E91   (02/2004 — 08/2008)
3' E91 LCI   (07/2007 — 05/2012)
3' E92   (05/2005 — 02/2010)
3' E92 LCI   (11/2008 — 06/2013)
3' E93   (09/2005 — 02/2010)
3' E93 LCI   (11/2008 — 10/2013)
3' F80 M3   (04/2012 — 06/2015)
3' F80 M3 LCI   (01/2015 — 10/2018)
4' F82 M4   (02/2013 — 02/2017)
4' F82 M4 LCI   (05/2016 — 12/2019)
4' F83 M4   (06/2013 — 02/2017)
4' F83 M4 LCI   (05/2016 — 12/2019)
X1 E84   (09/2008 — 12/2015)