With its billet aluminium construction and a light-weight brass/aluminium two-piece piston

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All the metal components on E90 rear suspension are from high strenght steel

and the only feature that rolled over from the Gen4 range was the mounting orientation

JR Wheels JR45 21x9,5 ET15-35 5H BLANK Silver w/Machined Face CB: 72,6 CVR6 With its billet aluminium constructionPCD: 5x108, 5x110, 5x112, 5x114. 3, 5x115, 5x118, 5x120, 5x120. 6, 5x127, 5x130 ET: 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35