And another part on order. The original dash speaker stopped working recently for the factory AM/FM mono radio. I pulled out the A/C ducting and accessed the wiring. I was able to confirm the bad speaker by using a jumper wire to an old Kraco 6x10 speaker.
I ordered a replacement speaker from Electro-Tech. I have bought their 4x10 oval replacement speaker before and it worked very well and fit perfectly into the factory under dash bracket. They are the correct 8-ohm rating that will work with the factory radios, versus all the 4-ohm replacement versions out there that will fry your original radio eventually.
With shipping it was around $59
http://www.turnswitch.com/speakers.htm