B5100 Battery

Hi folks,

I want to try start my b5100, its sitting idle about 2yrs.I'm looking for a new battery as the tractor came without one.I have read vic's excellent article on battery 101.My problem is that the space on my battery tray is quite small (140*190*200)and to get a battery with 850 cca that fits is proving to be a real challenge.Can anyone tell me a battery make and model that suits a b5100.If I had a few makes and models for the b5100 I hopefully might be able to source one over here.Tnx

From the response I got I'm guessing the amount of owners of b5100's is quite small.Could I ask any owners of a b6100 or b7100 to have a look and see what they are using as a battery,make /model etc.if they could measure the dimensions it would be a real help too.would love to try get this old beast going again.Tnx in advance

Thanks steve appreciate the help.