slotted nut

Hi all, My search for the illusive slotted nut for the HD air filter, part number 1124 141 8305, has so far been unsuccesful. I was wondering if this part can be replaced by a similar slotted nut, like the one with part number 1124 141 8300 or 1125 141 8300. I know STIHL is very good in reusing...