F4040 66 Tank Replacement American Standard

[IdRatherBeSailing]

I am trying to find a replacement TANK for my vintage F4040 66 American Standard wall-mount toilet. The tank is cracked. The lid is fine and is stamped L64. Made in 1964. F4040 66. Our handyman was in touch with the mfg who said replacement parts are no longer available. Any ideas? I really hate to have to replace the entire assembly. The wall-mount bowl works fine

 

[Terry]

That's about a six gallon tank for that bowl to get it to flush. My mother had one from the 1964 remodel of the home.
I replaced it with a new Gerber Maxwell wall hung.
A replacement would have to be something old from the 60's that someone else is tossing.