There is two different sizes of these, the ones that go with the Vola Aerobar setup and the ones that go with the Vola Pro clip ons...the difference is the thickness off the butterfly compression wedge and the length of the screws. If I were you I’d play it safe and buy it direct from 3T.
https://us.3t.bike/...kit-teamltd-447.html
https://us.3t.bike/...kit-teamltd-447.html