I recently bought a boat trailer and it needed the bearings replaced. When I removed the cotter pin and castle nut I noticed there was no thrust bearing there to go between the nut and the outer cage bearing. Both sides were like this. The trailer is a "Tennessee Trailers" brand from the late 60's. All of the bearings I have replaced in the past had this washer. Do I need to find a replacements? I took the nut with me when purchasing bearings and all of the washers were too small. Thanks for any help, Mike