It looks like you are looking for one of two radios. If you know the fender tag code, I'd try and get what it calls for.
R22 is AM with Stereo 8-track and that's what I need (anybody have one or the knob that come through the dash piece?)
R36 is AM/FM with Stereo with cassette
R37 is AM/FM with Stereo 8-track
I have a couple different pictures of R22 and I think the one in the car is right but if it is, I wonder if they could come with our without that big toggle or not. If anybody has a definitative answer, I'd be interested. Note that both of these have both thumb wheels on the left and that looks to be one of the big differences I've seen.