Just to add to this, even if it's for a 350Z, went to Halfords today for a replacement battery.
Asked to borrow a measuring tape to check measurements of the battery. I googled about and saw a mention of a 350Z owner that had previously bought at Halfords with success.
Measurements taken I headed back into the store and compared with the battery HCB005, the one mentioned in the review. The new one is only marginally taller and has 510 cold starting amps and 63 amp hours, so plenty of juice.