What is this Interior part? and where can I get it?

[slimjim]

Ok I have put off asking this question for months, as I was sure I'd find it. but I now need it and can't find it anywhere or even it's name.

I'm in the process of making and shaping my own interior, the doors are well underway and like every part of my build, taking much longer than expected.
To finalize my doors and continue the flow of the interior I need to start the rear panels, but with the curves involved I NEED the part I am asking about.



I know it exists because I've seen it used by 'Interiors by Shannon' on several of their first gen builds, I have attached a very blurry screenshot I took a couple months ago from their snapchat story. I contacted him but received no reply unfortunately.

Any help would be greatly appreciated, even just knowing what it is called will help my witch hunt.


James