My rv4 plans call out 5702-75-060 washers next to the spherical rod end bearings on the elevator pushrods. I don’t see these on the Spruce sight. I can’t find anything on google that tells me anything special about them. Are they just steel washers with non standard thicknesses? My kit is pre 1990 and it has passed through other owners so I have no nice organized hardware kit. Can I substitute AN washers if I have a good fit?