I broke off the rusty thermostat screw on my 1988 325is, so I need a new housing cap. I do not need the entire thermostat housing. From what I understand, this can come from just about any M20 (325e, 325i, 528e). Just make sure it looks like the one pictured below.
I will pay $15 shipped.

Cooling system-thermostat housing - BMW parts catalog
I will pay $15 shipped.

Cooling system-thermostat housing - BMW parts catalog
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