Engine Temperature Sensor

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    I fixed the dial end, so it works now, but the bulb end has a 3/8 MPS thread, and so expects to fit into a straight threaded hole and have a compressible sealing washer under the raised flare on the expansion bulb against a seat. See picture attached.. 

    Fine. My car doesn't have that. Don't see anything like it anywhere

    No wonder the bulb was dangling from the 1/2" MPT hole in the block when I got this pile of parts.There are suspicious hack saw marks on the fitting in the block at the freeze plug location. Can I suppose that such a fitting exists somewhere, or should I give up quickly and try to machine one, or possibly braze one up from machined pieces?

    What have all the experts done?

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