Hello guys (and gals),

I am brand new to this forum so please excuse my ignorance if this topic has been rehashed a thousand times before.
I have a 45 tonner on the way and would like to add sound.  My concern is with speaker selection and from what I've been able to gather the factory provides a 10 mm hole in the gas tank for this purpose.  I am familiar with membrane sub mini speakers having installed quite a few but can not find any of the correct dimensions to fit in this locomotive.

So I'm curious if there are any members out there that have installed sound in one of these critters and if so what speaker configuration you used.  As a sidebar, I will be incorporating a LokSound Select micro for the sound decoder.

Much obliged for any thoughts or suggestions.

Side Rod