No, its not a piece of the undertray, i closed the holes with a piece of L shaped steel, welded it on, and used a grinder to get the shape right... Looks pretty good, but the most important thing, is that it holds the frame toghether, making it strong.. As with the passenger foot rests, i chopped them of and grinded the welds down.. so it's going to be a clean look.. Got my slipon and rear seat today.. yess!!