Adaptor for GoPro that fits on a Cateye type tail light mount. With this part any suitable Cateye mount can now be used with a GoPro camera.
This long version is suited to the traditional GoPro case design and is long enough to provide clearance for saddle bags.
In this case the Cateye mount shown is the type that fits into the back of certain Fizik saddles.
This mount will suit most of the assorted Cateye mounts (including saddle rail, rear rack) shown here: