2 filters for a Mercruiser:<br /><br />35-807172 and 35-802893Q<br /><br />Both say they fit the external mount filter system. Both say they are water separating.<br /><br />What's the differance? Is one better than the other?<br /><br />Im running a 305 (220hp) GM Merc. I have the 807172 on it now.<br /><br />Thanks,<br /><br />H.