I went directly to eljer and could not find the part corresponding to the numbers you provided but if you are talking about the rubbery gasket, that goes between tank and bowl, it can be found at any local plumbing supply...most likely...and if it is the gasket you need then it does have to be exactly the right one or the tank will leak. if you're having trouble finding Eljer parts i would just buy a"fluidmaster" tank rebuild kit from home depot,lowes,ace,true value, etc (fluidmaster is everywhere) hope this helps but if you need anything else just ask:)