The BMW ETK for the E30 is generally excellent, but it falls short when it comes to A/C part number references. This is especially true for M20-powered E30s, which were equipped with three different compressors – Bosch, Seiko, and Denso. While the Bosch and Seiko setups share the same A/C lines, the Denso configuration uses different plumbing.

For posterity: the suction line part number for Denso-equipped M20 E30s is 64531380542.

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