Well one of my inner d60 seals is leaking again. On this site there are two different seals, http://mad4wd.com/index.php?main_pa...page=2&zenid=909f10f6373425a2b6200ff9de152c38 One is $8 and the other is $18. Is there a big difference? This is the second time replacing this seal in the last 2 years. Im thinking I might go ahead and buy the outer seals too.