The present invention is an accessory ready assembly that mounts to a support structure on a marine vessel. The assembly includes a male spline fitting having an end face that is configured to mount onto the support structure. A female spline connector is removably disposed on the male spline fitting. An accessory is disposed on an end of the female spline connector. A clamp is disposed on the female spline connector. The clamp securely fastens the female spline connector and the accessory to the male spline fitting.