Huh...I thought the Provari was 22mm.
Just a smidgeon over. A 22mm atty on a Provari w/ a beauty had a very very small ledge where the atty meets the ring.
When I bought the 2.5 Classic's, they offered an upgrade for them to the P3 head which takes flat tops. It wasn't just adding a beauty ring so it would look flush. The entire 510 was the P3 head, & took flat top batteries just like a P3. They had the 2.5 body & the P3 head.
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The Classic is not just 1 P2.5 w/ the flat top. It as a different board in it also. Yes you can put a flat top on a true P2.5 but that doesn't change the mechanical (for lack of better work) connection between the board and the +end of the batt.