Application Compatible for BMW 323i E90 All Engine 2006-2011 compatible for BMW 325i E90 L6 3.0L2006-2006 compatible for BMW 325xi E90 All Engine 2006-2006 compatible for BMW 328i E90/F30 L4 2.0L 2007-2012 compatible for BMW 328i E90/F30 L6 3.0L 2012-2013( Naturally Aspirated) Compatible for BMW 328i x Drive E90/F30 All Engine 2009-2012 compatible for BMW 328i x Drive E90/F30 L6 3.0L 2013-2013 compatible for BMW 328xi E90 All Engine 2007-2008 compatible for BMW X1 E84 L4 2.0L2013-2015OE/ Part number Driver Side( Left):19-B3226,19B3226,19-P3226,19P3226,34216768697,SL20473 Passenger Side( Right):19-B3227,19B3227,19-P3227,19P3227,34216768698,SL20472 Specification Installation Position: Rear Left & Right Inlet Port Size :M10 x 1.0 Bleeder Port Size: M8 x 1.25 Piston Diameter :1.65 in. / 41.94 mm Brake Piston Count:1 Piston Piston Material: Steel Installation Hardware Included: Yes Bracket: with Package included 2 × Brake Calipers (Showing as the picture)