Eight new seat shocks covering E30, E23, E24 and E28 seats + custom tool for installation!! The toughest part of this job is figuring out how to compress the 400N gas springs during install as its a much greater force than human hands can generate; we have solved this by making a custom tool. These new gas spring shocks cross reference to the following OE numbers: 52101965645 52101916601 52101965632 52101965646 These 8 shocks are 400N each and work perfectly for both the seat back and seat base.   The ends of the tool are 3D printed from PETG and have sleeve bearings.   $250 shipped to North America (US/Canada)   $260 shipped globally outside of NA   $90 shipped globally (NA inclusive) Tool Only   $160 Eight Seat Gas Springs without Tool shipped to US/CAN   $180 Eight Seat Gas Springs without Tool shipped globally outside of NA   Email Admin@rtsauto.com for volume discounts when ordering 3+ sets of seat shocks.