Here is some more information for identifying E-Body radios. This is a 1970 AM radio code R11, but all E-Body radios share at least three key features;
1. Note the protrusions outlined in red with the locating pins. The one on the left will be a long rectangle, the one on the right can be a shorter rectangle or square. All E-Body radios 1970-1974 have these.
2. Note that the attatching screws outlined in yellow secure the radio from the bottom.
3. The third E-Body feature is not shown, but only the E-body radios have the antenna lead plug into the bottom of the radio.