THIS IS A BRAND NEW OEM GASKET, R. 92N @ *O RING 8x1.7 91306-HB3-003 CLUTCH_ADJUSTING BOLT_ORING ALL_50/70/90/110'S WITH_AUTO_CLUTCHES 1/20A (R2061)THIS IS AN OEM O RING MEASURES 8x1.7mm FROM OUTSIDE EDGE TO OUTSIDE EDGE MEASURES APPROXIMATELY 7/16 INCHES. R2061