Anti vibration mount for the APM 2.5/2.6 flight controllers available from 3D Robotics.
Update: I've added an .IGS file for people who want to modify the design.
Update October 2014:
I've added a modified version specifically for the APM with top entry ports. This is slightly shorter than the side entry APM. I've also added a 92mm x 44mm baseplate for the top entry version, which should fin the Tarot 650 mounting pattern. These new parts have 'v1.6 TE' to designate Top Entry.