I have not yet successfully done what you are trying to do. But there is a video on you tube showing someone replacing just the clip successfully only there is no sound therefore no description of what is going on. I can tell you this, you will need some kind of hands free magnification, some good tools and a lot of patience.
As far as getting the part... it's very hard to find just the clip, but you can easily order the connector with the clip on it, remove the clip and attempt to install just the clip onto your connector.
I've watched the guy on you tube do it so it can be done. I just don't know how, yet.
KD