Placing Boards around Vehicle

[Sakzayn]

Hello,

I am trying to place 8 boards around my vehicle to define my region of interest. First, I do not see any props that looks like a vertical board that I can place around. I see something close to what I do need but I am unable to adjust the width since the prop has no width attribute.

Can someone suggest what I can do to fix this or if there is an object I do not know of that looks like a board. Thank You.