What the heck is it?

[MEK-Dangerfield]

This is a wild guess, but is that a plug for the right front fender for radio delete cars?     

['Cuda Hunter]

Nope.  Not a radio delete plug.   Wish I had one of those. 

Hint 3.  Your sizing is about right though.

[dutch]

probably an M46 barracuda sidescoop mounting hole delete plug, but I need a better pic... 

['Cuda Hunter]

Nope.   Not m46.    That's funny.

This is a 70 And 71 thing.  And I do believe the same part exists on the challenger.

Better picture won't show you much really.  Just clearer rust and old chrome/stainless.

Usually, every one that I have posted on here gets picked out pretty quick.  But this part is relatively hard to find. 

[JS27N0B]

I'll bet the challenger deputy models came with 2 of those and were minus 2 out of the 4 other items.

['Cuda Hunter]

You got it.   
A 93 option.
My 71 is a coupe. 

Your turn  ! 

[JS27N0B]

You got it.   
A 93 option.
My 71 is a coupe. 

Your turn  ! 

That was supposed to be a clue for someone else to get the answer 
I am away on holiday till next week if someone else wants to continue...or actually state what the picture is and where it belongs on the interior of the cars.

['Cuda Hunter]

I'm leaving for vacation today. So I can't put up another picture.

But I guess you did not call out where those plugs go.  So.......

[roadman5312]

 

[burdar]

I don't think anyone took at guess at the picture I posted back in 2012.

5th post down on the last page.

[RzeroB]

You got it.   
A 93 option.
My 71 is a coupe. 

Your turn  ! 

So what was it?

Deputy had fixed rear quarter windows ... so is it a plug for the rear interior panels where the window crank would have been??

[1 Wild R/T]

You got it.   
A 93 option.
My 71 is a coupe. 

Your turn  ! 

My 71 A93 had black plastic plugs with texture matching the rear interior panels....

[Chryco Psycho]

Magnum wheel center retainer

['Cuda Hunter]

So what was it?

Deputy had fixed rear quarter windows ... so is it a plug for the rear interior panels where the window crank would have been??

Yes, it is a plug for where the window cranks would have been. 
The car had what I am assuming was the original white interior.  Beat to death.  But it retains it's window crank plugs. 

Just got back from vacation. 

['Cuda Hunter]

Indeed.....   

I don't think anyone took at guess at the picture I posted back in 2012.

5th post down on the last page.