On the back of my 96 Challenger there is no ski tow ring there, just a metal loop. Is this normal for these boats? Now for skiing or kneeboarding I can use the pylon, but when I want to pull tubes I would like to hook them up at the back so I don't bend the pylon. Can I just remove the loop and install a tow ring? And are those universal, or will it need to be ordered from the dealer?