I lost one of the U-Nuts of my Head Unit Cover for my Toyota Rav4 XA20, so searched far and wide for a model that can fit, but didn't find one. At the end I remixed the closest model that I could find to what I need.
I'm using a M5 nut to fit in the holder and it looks and holds quite well.
Toyota_Head_Unit_U_Nut_Holder.stl | 13.4KB |