This is a reproduction rubber item that closely resembles the original rubber cover on the back of 860GT etc. As you can see, it is close to the same but does the job perfectly fitting those large 4 prong ignition switches that were mounted down on the frame. The ID of the rubber is ~ 42mm and it is 43mm deep inside. The overall length of this including the wire stub hole on the back is 64mm.
* Switch Not Included *