I got my battery for £20 from Autosave in the end.
They should be able to order whatever your after but quote the number on the battery as they wont know by the model of bike.
Write down every number thats on the battery as the one which they eventually recognised on mine wasn't the one I thought they'd use.
Took a couple of trips to King STD to find out and eventually took the old one in so they could look at it.