I hope you can help me. I discovered a link under the ballcock. After removing old ballcock, I found a crack in the tank by the hole the ballcock goes into. Not sure if this can be repaired but thought I should replace the tank. Went to Home Depot where the tank was purchased about 3 years ago and found out it has been discontinued . It’s model number 4028. I hate to replace the whole toilet. Does anyone know where I can get an American Standard Tank #4028 or is there another tank that will fit the bowl that this sat on or can I seal the crack with anything?