40 Bed Wood Question

[TomT/Williamsburg]

Still working on my wife’s 40 Pickup and I have a question on the cab side transverse mount. Since my frame is a 36, I am happy that most of the holes I need are there but this wood mount I wanted to ask the experts about.

This piece bolts to the bed but how does it attach to the frame? It is right about where the center frame rail joins the side rail and I see two holes. The one closest to the cab is right in top if it, the other seems too far away. How close is this piece to the cab?

Thanks for any help you can give ...,