I have an older Case toilet with a No. 1040 on the inside of the tank lid and a date of May 1940. This is a 2-piece Case toilet, and the tank is held together by only one bolt. I am trying to replace the flush valve assembly, as all the seals have deteriorated. Any idea where I can get parts for this. All the places on the web have parts for the one piece older Case toilets and don’t even show a two-piece Case toilet. I will follow any leads anyone suggests. Thanks.