Hey guys.
I'm new to the forum and would like some help if possible.
I live in Brazil and I bought a 1966 mustang convertible. Unfortunately, the car is dismantled and missing parts. One of the missing pieces is the one behind the door, next to the back seat, as shown in the photo. I don't know the exact name of the part, when I search "quarter trim" I find a part that covers the missing part, but never the part I need.
Could anyone help me with the name of the part or parts I need to purchase and where I could find it?
Thank you very much in advance!

My car:




Expected part:

i found this pic when i was searching the part i need

 

Here is a photo that better shows the part I need:


Thanks in advance!