sadly, if i were wanting a special[ty] battery, and had to order one, i would check out a battery "warehouse" place that would be semi-close by and do an in-person request.
any problems arising from the order would be a lot easier to deal with.
having said that, i am very luckily to have a battery place only about a mile and a half from my driveway.
they can get any type and size i could possibly want, and their prices are [slightly] cheaper than the parts stores or dealerships.