This is a Rectify Series drop-in speaker system for Intermountain GP10 locomotives. It also fits the U18B and possibly other IMR units. The speaker features notches for the wires to nestle in. The speaker uses carpet-tape or a touch of adhesive to mount and no modifications are needed to replace the factory speaker.
The speaker comes fully assembled and tested.
Dimensions are: 11mmH x 18mmW x 35mmL