This hydraulic power steering rack and pinion assembly is designed as a direct replacement for select 2003-2009 Toyota and Lexus vehicles, including the Toyota 4Runner, Lexus GX470, and Toyota FJ Cruiser. It is built with 45# steel gears and a 40Cr alloy housing for durability, corrosion resistance, and reliable long-term performance. The optimized gear and rack meshing design helps deliver quick response, stable handling, and smooth steering control. A fully enclosed dust boot and high-pressure sealing design help reduce leaks and protect the steering system from debris. This unit is intended for left-hand drive applications only.