Recently obtained a 98 xj for a steal because the TC was rattling, needless to say it is the chain, but long story short. While removing the metal seal cover/slinger on the rear output I kinda destroyed it. I have checked morris and several other places and all they offer is parts for the early style np231 with the extension housing. Anyone know where I can pick one of these jewels up? Also what are the pros and cons of the two drive chains morris offers?