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Go on ebay and type in IS300 Knob, then see what comes up. I think a lot of them tell you. 48mm? I can't remember:confused:
 

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Ok since I figure you won't do it your self i did a quick check and most of them, even brands like momo and what not come with multiple fitments: 8,10, 12mm
I know for a FACT that one of those three is our car. 14mm is an option too but i know thats not it
 

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I just went out and measured mine. Diameter is about 12 mm and thread count is 10 threads @ ~12 mm. Guess that makes it M12 x 1.25 mm.

Kind of an odd ball size as most I find are M12 x 1.75mm.
 

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We have the same threads as toyotas. If a knob is advertised for fitting a toyota, it will most likely fit the IS
 
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