I went to radio shack, picked up these speakers for $15.00:

Busted them all to hell...

Installed the drivers here (the speaker grills push on and pull off as they did on on the original speaker enclosures):

And installed the entire faceplate with on/off switch, volume and as a bonus, a headphones socket, to the top of my cabinet:

I am going to paint it black shortly.
It works nicely...the sound is easily better than stock (I have a single mono speaker JAMMA cabinet)...and the headphones socket is a bonus!