Perfect fit for my 1990 Buick Reatta. This kit includes mast cap, isolator and mast bearing. when changing shelves. When tightening the 24mm strut nut, be sure to use an OTC 7544 24mm strut nut socket to ratchet the upper tube while tightening the strut nut with a 1/2" torque wrench. The OTC tool eliminates the use of a vise on the polished strut piston rod, which could damage the polished rod.