84 Blaupunkt sacramento radio removal...help needed

[grant mills]

I've removed the coin collector on top (where the speaker originally went), as well as the front knobs and support nuts at the front. Does the support bracket for the top tray also need to be removed for better access?  I can not see any side connections holding the radio in place. Is there a lower tray or some other mechanism holding it in place? Judging by the workshop manual description, I don't want to remove the dash to get to the back. I am willing to remove the front seats if necessary to get down on the floor and work from underneath. Any hints or pointers in the right direction would be appreciated.

Yes the radio has failed (or faded to almost no sound) and the tape deck has eaten a tape. I will fix or replace as practical.