The Cervelo top tube cable guide fits the P2; P3 and P5-Three triathlon and time trial bikes. This guide fills the gap at the front of the P-series top tube and does not work with any other bicycle.
The cable guide is not needed with the P5-Six when using the Aduro aerobar.
Thanks for selling these hard to find replacement parts for my Cervelo. Shipped the same day I ordered.