Module script GetChildren?

So what I'm trying to do is find all the parts inside the model Grass named wall. module.position is my "Players position" which starts, as you can see, at (0,0,0) I'd like to print the wall's module position. So lets say 4 movements up is (0,0,4), it prints (0,0,4).

Inside my module script (I also have more code that works in here. This are just what I need help with)

module.position = Vector3.new(0,0,0)
module.parts = game.Workspace.Grass:GetChildren()

Inside my LocalScript

for i = 1,#module.parts do
            local wall = module.parts[i]
            if wall.Name == "wall" then
                print(wall.Name) -- Prints all the parts named wall, It works c:
                wall.pos = Vector3.new() -- Where I need help defining
            end
        end

Thank you! c: