Stock speakers

[AJNapierski]

I would like to see some pictures and get some tech info on the stock speaker setup for my 66, it had a speaker in it that just floated around on the passenger side, a careless passenger stepped on it and now it doesn't work I removed it and now I am looking into replacing it, I want to put one under the dash but I can't find much info on how it actually mounted or what size the box is or even where I might find one for a reasonable price. Please help I can't stand not having any tunes while driving.