The RAM-B-272U consists of a 1" diameter ball and base with 9mm hole. This part is often used on motorcycles, attaching to the mirror stem.
We've gone "a la carte" with most of our RAM pieces, build your mount however you want it! Please let me (firstname.lastname@example.org) know if there's something you'd like that isn't listed, or if you have questions about how to build your personal mount.
RAM Mounts 9MM Mirror Mount
Produced by RAM Mounts of USA