AM radio bracket

[1BadDodge71]

I plan on putting the factory AM radio in my 72 Plymouth Duster and installing a hidden modern unit that I can plug my iphone into.But I cant seem to figure out how the bracket on the AM goes on.The radio and bracket was in the trunk when I bought the car so I have no idea where it bolts on to.

 

[1BadDodge71]

Nevermind,
I found this is not even the radio originally out of the car and neither is the bracket.The radio I have has the bracket mount on the side but the the radio originally out of my had the bracket on the rear.The radio I have is apparently out of a 73-75 Abody