PHBG intake for Peugeot Polini cases

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I have a set of Polini cases for Peugeots, and realized the PHBG intake that came with the cases is only 19mm. I plan on running a 21mm PHBG that I have lying around. I don't seem to be able to find one that measures 21mm for the polini cases. I could MAYBE widen it to 20mm, but the metal is thin and feels brittle. Ideas?

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