Jon, none of the ones there are correct. The specified one is like a pack of chewing-gum but with a step in it so that idiots can't put it in the wrong way,and one lump contact at each end, and mine is Aiwa original, so they may all be. You have the # and capacity right.
I believe there is an external arrangement for it, too. Mucho bother.
Looks as if I will have to become an EBay buyer, but that is a bother too, as they have no presence in NZ, -We have an equivalent called TradeMe- and people are wary of trusting foreign first-timers.
Aiwa is now owned by Sony, so they will likely be phased out, Sony having their own MDs.