SPL Parts PRO Solid Aluminum Differential Mounting Bushings (SDB) eliminate the stock mushy rubber bushings on the differential pumpkin when adapting J30, Z32 (NA), S14, S15 or Skyline rear differential pumpkins to the S13 rear subframe. These bushings will hold the differential solidly to the subframe, reducing wheel hop and improving power transfer to the ground. Our SOLID series Bushings are precision CNC machined from 6061-T6 Billet Aluminum for an accurate fit. Kit includes new mounting bolts. Sold as complete kit for one car. Made in the USA. Application List: 1989-1994 Nissan 240SX (S13) Installation Instructions: SPL Solid Differential Bushings