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I looked at them, the do not make an in the hose probe.

They make two types, in the fins and a thread in sensor set up.

Well they used to because i have one. The kit comes with a piece of tapered rubber you put on the probe so the clamp doesn't crush it(inside the hose at the upper rad inlet). They may not make it anymore but you should be able to adapt one to work. Here is one but not flex a lite.
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