Rotary 6758. FITS BRIGGS & STRATTON 10-12 HP HORIZONTAL & VERTICAL MODELS: 251000, 251400, 251700, 252000, 252400, 252700, 253400, 253700, 280700, 281700, 282700, 283700, 286700, 289700, 28A700, 28B700, 28C700, 28D700, 28M700 SERIES.