These are drop-in speakers for 2023+ Athearn Genesis U50 locomotives. These do not fit the early Genesis U50s or the Athearn RTR U50s, both of which use two round speakers in the floor. If you need speakers for that version, they are found here: https://www.scalesoundsystems.com/product-page/athearn-rtr-u50-rear
 
Two options are available:
 
The AHGS-U50S speakers replace the stock speakers/weights and simply screw-in like stock. There will be about 2.6 ounces of weight-loss doing this but the model still weighs a whopping 1 lbs. 13 oz. without the stock weights. There is a large areas behind the rear speaker where you can add weight to makeup for the loss if desired.
 
The AHGS-U50B speakers replace the front and rear blower details. This lets you retain the stock weights but the see-through screens and blower detail will be blacked-out by the speakers. Simply use some thin mounting-tape to secure these speakers in place of the blower details.
 
A third option uses the AHGS-U50S in the front position and an AHGS-U50B in the rear position. This retains the front see-through screens and blower detail and the much larger rear speaker/weight, resulting in only 0.6 ounces of weight-loss.
 
The speakers come assembled and tested.
 
Dimensions:
AHGS-U50S-RC1: 14mmH x 18mmW x 40mmL
AHGS-U50B-RC1: 24mmH x 18mmW x 30mm