Bird line section dc connector question...

[JesseJamesNEC]

On a bird or coaxial dynamics line section there is a connector that you connect the RG58 to that goes then to the meter, what the hell do thay call that connector on the line section? I have a line section that doesn't have that connector and I wanna try and get one BUT I don't have a clue what the hell CDI or Bird calls the thing! My line section is "set up" for it BUT where that connector goes is a small "D" shaped plate covering the hole. I just need to know where I can get one and what it's called at least! If ya can help me out I sure would appreciate it! Thanks!
The part I need is circled with an arrow at it:

 

[DIRTYWHITEBOY]

as far as i know its called a dc connector,one of these places might have it
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[JesseJamesNEC]

I checked both already, but I thank you for the response! what I have found out, at least this could be correct is that the part I need is called: dc jack and spring finger assembly..... of course I cannot find any place that sells that part!

 

[Drifter]

I checked both already, but I thank you for the response! what I have found out, at least this could be correct is that the part I need is called: dc jack and spring finger assembly..... of course I cannot find any place that sells that part!

Fat Boy sells it for $15. Scroll to the bottom of page BirdSupplies

 

[JesseJamesNEC]

Fat Boy sells it for $15. Scroll to the bottom of page BirdSupplies

that is not the part I needed, I need the part that THAT screws ON TO actually.