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Not a valid part #. It should start with 9262K. 9262K266 (Buna-N) is for a 3mm O-ring with 12mm ID. Is that the one? Or maybe 9263K126 (Viton® Fluoroelastomer)?
You'll need to drain some coolant to get it off. I'd just drain into a cean bucket from the radiator. Remove, clean, and lube the shutter stat, replace, then pour the coolant back in.
I need to clean mine again. It's starting to stick open again.