...I'm pretty much in the bolt with you! About all I know is that "LW" means "lock washer".
...maybe, IF you look up the part number in the master parts book the part number would probably say what it is??? I don't have a master parts book but if you look around there is some listed on line.
....or you have to do what I do when I don't remember. Use what fits or works better at the time!
