So I’m about done with my build and realized I don’t have the spring that goes in between the drive shaft and the diff to keep tension… I’m told I need that!!?? anyway I’m looking at the manual to make sure I have all the orings and notice that the rear axle housing needs it’s own orings or so it says in the manual but the parts diagrams dont show?? as well as the obvious ones for the diff and the brake housing but when I look it up they do not have a part number but i notice there the same size as the front of the diff to swing arm oring?? Any help would be awesome and do I need them?