Here's an update on the speaker install.
I used the bracket that was supplied with the speakers. The measurements were almost the same as the old speaker with the original mount. The new mount just needed to be trimmed a little from the back so the screw would fit and line up with the bottom speaker mount.
I trimmed just enough off the back end of the bracket so the original screw mount would line up with the slot (see bottom of the photo). The rest was just putting everything back in place.
I also installed the Redi-Rad to the original radio.
The radio works fine for an original even though its only AM and doesn't have stereo. But now I can connect my I-Pod or my cell phone to play my music.
The sound quality is pretty good, you just have to fine tune the radio to hit the right frequency.