BRUSH-CARBON 4 BLADE TWINBLADE MOWERS 2 Required on the Models listed. Fits Model #'s RE18 Series, RE181 Series, RE182 Series, RE183 Series, RE184 Series, RE185 Series, Series numbers are followed by the following Suffix #'s or Alpha or Both: A, B, C, ST, -1, -2, -3, -1A etc, 1B etc or 1C etc. Example is RE184-1C Also used on Rotary Single Blade # RE120, Reel Mowers #'s E200 Series & E800 Series. Suffix #'s Above Apply.