I am trying to replace the filter on my fuel sending unit, on my 71 Duster. When I took it out of the tank it didn't have a filter on it. It just had this weird looking think on the end (see picture). Not sure if this is part of the filter or if the filter attaches on to this? Or do I need to remove this thing? I am having trouble finding one online. Does anyone no where I can get one online or part #. I don't want to buy an after market sending unit as they are not accurate and my sending unit still works when I tested it. Thanks in advance.