Found an interesting radio counterpart under my dash.

On the back sode of the radio, there's a sticker. It was re-worked at some time.

I took down the RT speaker.

Forgot. It's a '71.

See if you can contact Jim (Norsky)  He lives up dere in dat Mn place heh??

      I suggest that you check with our supporting vendors for replacement speakers. The stock size is 4x6. A big benefit of going with an aftermarket speaker is having a separate tweeter built-in for better high frequencies. That helps to hear the music over the rumble of a big block!      

Yes, they are 4x6, but I don't think you can connect "new" speakers to your original radio.  The circuitry is not compatible (something about ohm's I believe...).

I think they sell speakers that would fit the original radio; but you still won't get much out of them.  You could also go the other route; which is to replace the radio and speakers.  They sell some that have the decent 70's look face-wise, but have today's goody's (electronic circuit, aux input, ipod connection, sub connections,...).

Steph.

That is simply the stock amplifier for the stock radio. The space available for the radios was limited, so in order to make it work the amplifier had to be a separate component. ALL early Sharks with a radio had this component mounted on the firewall. I believe the stereo systems had one other component mounted up there, too, but I may be wrong. In '77, a console re-design allowed the use of a "normal" radio head, ending the use of the separate amp system.
If your radio has a small, round, yellow/amber  light in the upper right side of the dial, it is a stereo unit. If it does not have the light, it is a mono unit. I think what you have is the basic, mono AM/FM radio set-up.

Thanks for the advice.

I've found a few Sony 4 x 6 speakers at the local walmart.