What he's trying to spit out is that 1JZGTE's never came with W series gearboxes, only R series boxes. The 2JZGE was the only JZ series of motor that was fitted with a W58, and this is where you'll source a bellhousing from to suit the smaller style gearbox.
Are you sure about that?
I've seen several 1JZ's fresh of the boat at importers and they have W58's bolt to them. Not saying that they couldn't have been molested in Japan though..