This solid 14 inside diameter aluminum bushing eliminates a classic problem point with the sloppy OEM rubber bushing and its short m12 mounting bolt. To add convenience in converting to the m14p1.5 70mm length bolt, we have included the appropriate drill and tap needed to convert/fix the m12 threads in your differential housing. **Recommended to use with solid diff cover bushings to ensure proper diff mounting position. These bushings are a slip fit installation and may require epoxy due to variation in the stamped subframe holes.