What Car radiator cap fits a 2004 YZ450F 15-20psi

Looking to find a replacement radiator cap for a '04 YZ450F. Dont want to spend $30 to $50 for stock. Car radiator caps cost $10 at NAPA. Is there a model of car cap that fits a YZ?.... thanks

P.S. Tried a 80-85 Toyota Corolla. It was the right size but is rated at 13psi...

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