Wondering if anyone knows what the box is under the bow on the drivers side that takes up 1/3 of the space under the playpen open bow in the 1995 sport nautique? I am looking at adding ballast to it. What ballast bag fits well in the ski locker (it measures 19wx68lx10h)? What ballast bag fits well in the front bow? What works good for weighting the back of the boat?