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BMW Z3 Seat Bushing Kit ( view PDF instructions ) If your seat bottom has movement front to back, the cause is defective seat bushings. Kit includes eight parts which is enough to fix both seats. This is a permanent repair, made using an Acetal Resin with the trade name of DelrinŽ! BMW offers a kit that is made with the same original rubber that is prone to fail again. (OE #52-10-7-137-499) $30.00