Detailed product specifications Manufacturer: FCP Engineering Model: FCPRHB14553622T Profile: H beam Center to center: 145mm Large end diameter: 53.6mm Sleeve diameter: 22mm (Tapered small end) Quantity: 6 pcs, 12 pcs ARP2000 3/8" screws Made of: Forged steel 4340 EN24erDeclared power: 1000KM (6 cylinders)Declared revolutions: 9000 rpmBMW E90, E91, E92, E93, E82, E88, E89, X6, Z4, F01 (N54B30)Fits original pistons