I advise accurately measuring the existing battery case before ordering a replacement battery.
I found that there are several different sized cases available and although they were rated at the same Amp Hour number, some of them were just 1/16" larger than the one I have. If I accidentally bought one of those batteries I wouldn't be able to fit it into my bikes battery box, even with a big hammer!
There are also the right sized battery cases but they have the terminals reversed from what I need so be sure to check out what you are ordering first.