If your in the market for a heater core for your E30, you should know that there are two different types of heater cores that covered near all E30 years. When referring the ETK or RealOEM you find both heater cores listed, but they are certainly not interchangeable

There is the 64118391363 and 64118391362 (same as Nissens 70501). The easiest way to differentiate between the two is that one uses plastic inlet tubes and the other aluminum.

64118391362:

64118391363:

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