The Hispec are not the same as Alcoa. I never could find a stabilizer to fit. I ended up using black silicone to anchor the stem to the inside of one of the openings. Downside is if you ever have the tire off, you would have to reseal.
3 years and 15k miles was never a problem.
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2021 Isata 5 30FW
2014 Honda CR-V
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