Summary

These are 4 different sized speaker enclosures for 9x16 mm speakers. One (.130) high is what I used for a LokSound install for '95-96' Atlas GP7/9's.....

https://1fatgmc.com/RailRoad/Decoder-1/page-31.html

The other are generic sizes of three different heights.

You can find other 3D printable parts for your layout here....

http://1fatgmc.com/RailRoad/RR%20Main/Railroad-Index.html

The prints were done with an AnyCubic Photon Mono.