Well, if your dead set on getting a exact OEM battery, best bet is to try a different dealer than knows
what to sell you!
other wise, measure the battery you got, then check spec's on other battery's of a size that will fit in the battery tray on your machine and have terminals in same spot as current battery!
odds are MANY different sized batteries will work just fine problem free
if you live were temps get below freezing, the higher the amps' IMO the better! for cold weather starts, which is why I gather they call for either a 24 or a 31A , with the 31A being for colder environments!
if you look at bobcats'chart for your machine they call for two different types of batteries too
from group 31a or group 24, I am guessing they share a same size or close and difference will be cold cranking amps and such, and then prices!
you can then pick what brand you like or price shop
but again, odds are any 12 volt battery with 660+amps and fits in your battery try and has terminals in right spot will work for you