I have an American Standard toilet. I am not sure how old it is, because it was in our house when we bought it. It could be 20 years old or so. The tank cracked on it, and I bought an American Standard replacement tank. When trying to install the tank, the holes in the bottom that attach it to the bowl do not line up correctly. When I put the bolts in the holes, they go in at an angle. I can only tighten them down so far, and cannot get them to fasten down snug. I thought that by buying the same brand of tank, that it would fit without a problem. Am I doing something wrong? Do I just have the wrong tank? Am I going to have to replace the toilet? Thanks for your help!