There were three radio options for 1970 Challenger and Barracuda models. If no radio was ordered, your car would have a radio block off plate installed and no antenna hole punched in the fender or rear quarter panel in the case of the Trans Am cars.

Here is what the smooth block off plate looks like, it was used in Barracuda models with the standard cluster or Rallye cluster and all Challenger models with the Rallye cluster;

The block off plate was also available in a ribbed version, it was used in Challengers with the standard guage cluster only;

Here is a photo of a smooth block off plate installed;

These plates and the cars that did not come with radios are commonly referred to as "radio delete", which is a bit of a misnomer since radios were not standard. It is easier to say "radio delete" than "radio not ordered" though.

For the radios that were optional we will start with sales code R11 - Two watt Music Master Radio;

The R22 - Ten watt AM / Eight Track stereo radio is a thumbwheel type;

The R35 - Ten watt AM / FM stereo radio is also a thumb wheel type;

Some radios used in other models look similar, but will not fit in an E-Body. So if you are cruising the swap meats or Ebay trying to find the correct radio for your restoration, here are some things to look for. Shown here is a 1970 AM radio - Sales 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 attaching 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.

Special thanks to Scott Smith and Tom Race for supplying the radio block off plate photos.