one-piece toilet repair

I just purchased a new tank repair kit (FluidMaster 400AK) to replace the inner workings of my one-piece toilet. It doesn't look like it's going to be compatible. The toilet was continually running and old so I figured replacing the whole insides would solve the problem. Can anyone help me with getting the right internal working parts for my toilet. Its a low-back, all one piece model with a push button flush on the side. Oh, and it's all currently all apart and out of service. (Don't worry...we DO have a spare, but it's outside with a half-moon on it's door......just kidding) Thanks in advance. Why won't it work? It should. Just follow the installation directions that come with it. Mike If it is an older model toiloet it might not work. The older one piece toilets have the tank around the bowl and use a different type of balcock setup to fill the bowl after a flush. What type of toilet is it? did u throw the old ballcock away? You're right, there is a space around the bowl inside the tank. The toilet is stamped Standard #313. Low back, all one piece. The tank isn't divided from the bowl area. I saved the old workings, may need them for part numbers. It has two holes down inside the bowl, one for exit and one for refill. Still apart.... Thanks. I also forgot to mention that the inner workings were connected by a short piece of about 3/4 in. plastic tubing to the back side of the bowl. I'm assuming for bowl refill. They weren't your typical toilet guts. I WOULD have a weird toilet....not easily fixed or average. Thanks again. bring the old one to a plumbing supply houes and purchase a repair kit for it, then reinstall it. I'm making some calls to plumbing supply stores with the part numbers. I've found that it's a vacuum style toilet and the vacuum breaker is what broke. It may be to my advantage just to purchase a new toilet than pay for repair parts for this old one. Thanks, everyone for your help and info.

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