When an E36 power steering pump actually needs replacing, order it by your VIN, not a single part number off a forum — the E36 ran both ZF and LuK pumps across the years and they do not interchange.
The pulley, mounting ears and pressure/return port layout differ between the ZF and LuK castings — and again between the four-cylinder (M42/M43/M44) and six-cylinder (M50/M52) applications, and between early and late sixes
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