This is a Rectify Series drop-in speaker system for Walthers Proto (current-runs) and Mainline NW/SW-type locomotives. The speaker uses the factory mounting screws and no modifications are needed to replace the factory speaker.
 
If you have a factory sound model, you can reuse the 2pin speaker harness. If you need a 2pin harness, most of these models use the small, SH1.0 JST harness: https://www.scalesoundsystems.com/product-page/factory-pcb-speaker-harness-small
 
The speaker comes fully assembled and tested.
 
Dimensions are: 11mmH x 22mmW x 25mmL
 
VIDEO: https://youtu.be/5JICI9hBSA0