This is a Rectify Series drop-in speaker system for Rapido Dash 8-40CM "Draper Taper" locomotives. The speaker is a beautiful press-fit over the rear drive-shaft and no modifications are needed to replace the factory speakers.
 
The speaker comes fully assembled and tested.
 
Dimensions are: 29mmH x 16mmW x 25mmL
 
VIDEO: https://youtu.be/2XwgoNtTiRY