I am noticing that in a lot of pictures of this bike, there is a triangular section above the skid plate that fills in this gap between the frame and the plate. On my bike, however, there is no such section... !? Is this piece missing? Is it a stock piece, or do I need to buy it? (Where can I buy it?) Without this piece, the bottom of my skid plate fills up quickly with mud, rocks and everything else. It seems as though Yamaha would not leave this section out for any reason. Thanks!