2、Interchange OE Part Numbers: Gasket replace HS8-21112, SL1000, HS9790PT-12, HS9790PT-13, ES72798 (X2), 3-391SA. Reference Numbers: HS8-21112, SL1000, HS9790PT-12, HS9790PT-13, ES72798 (X2), 3-391SA.