Help me find this part
 

I accidentally snapped this piece of plastic on my 2015 Lexus IS350 FSport when wrapping the vehicle and had the door handle off.

I don't know what this is called but it is from the rear Left passenger door.
The door does not open from the outside without this part, but I can still open the door from the inside just fine.

I have attached a few photos to this thread in hopes someone can recognize it and tell me where/how to get it without having to make a trip out to my dealership service/center.

https://cimg0.ibsrv.net/gimg/www.clu...17a4cc736f.jpg
Text says 400R
https://cimg5.ibsrv.net/gimg/www.clu...6321b4a34c.jpg
https://cimg6.ibsrv.net/gimg/www.clu...a2144557b1.jpg

Thank you in Advance !!

Here's a link to a parts diagram for the rear doors: https://parts.lexus.com/a/Lexus_2016...2430-6706.html
I have a feeling that part is part of a larger part that's inside the box in the diagram....but you likely know better where it was located on the vehicle specifically.