The part is connected to the subframe and the w brace band. Please if anyone knows it’ll help.

I still have no idea what you're pointing at, for the future it helps a LOT if you simply place your finger, or a screwdriver, or even a piece of tape ON THE PIECE that you need identified.

I'm going to assume you're looking for the rear member stay ????

Left side
https://conceptzperformance.com/niss...01_p_16355.php

Right side
https://conceptzperformance.com/niss...001_p_8435.php