Aftermarket Radio Antenna Plug for MK4 Golf's

[Merlin8r]

What is this small bit you refer to that is missing? Do you have a picture you should show me as to? Are you referring to the pin like dead set in the middle of the plug? I think i know what your referring to but dont want to pulling out the wrong thing

Yep, that's exactly the thing. It's not attached to anything, but is a tight fit so you'll need a pair of pliers to get it out.

[NJAY87]

So the actual pin is on the headunit? Does that mean once pulled out i can't put it back in again if i want to put that factory headunit back in place?

[Merlin8r]

Yes it is, and yes you can.