Just over 3 years after its introduction, a new version of the Nissan Fairlady Z was to be launched in Japan. Not necessarily a new model, but rather a new body shape. The 2by2 or, as it was called in the export markets: 2+2 as an additional variant to the short Z, which was also to receive a major update.
 But not only was there to be room for four people in the Z from 1973 onwards, there was also to be a new, larger engine - especially in Japan.
While even the L24 engine had previously only been available as an option in Japan due to tax restrictions on 2.0 l displacement and also somewhat later than in the USA, it would be a big step forward if the car was now to get an L26 engine.
The vehicle shown at the 20th Tokyo Motor Show was called the Nissan Fairlady 260ZE 2by2 for a reason. 
A four-seater with a 2.6-liter engine. A sensation. What's more, with the streamlined ZG add-on parts, consisting of the long front end, headlight covers and dark-painted bumpers, which had already been introduced for the Fairlady 240Z and ZG models in previous years. 

The car was also to be fitted with 4 disc brakes and an electronically controlled fuel injection system!

But this never happened. Neither was the L26 engine introduced in Japan, nor did the ZG front officially make it onto Datsun 260Z models exported worldwide. And even the vehicles sold in Japan after mid-73 did not have a long nose.

The reason for this was the 1973 oil crisis and thermal problems due to exhaust emissions (probably the strictest regulations worldwide in those years!) that the cars had at high temperatures.
Although a few 260Zs including the L26 were produced in Japan in 73, they were quickly withdrawn and re-engined with an L20 engine and given a new/old model designation. However, these were all only 2-seaters.
In the end, the long ZG with an L26 engine on board only made a brief appearance.
However, it was never completely forgotten, as even years later there were still various toy models of it.

However, the fact that Nissan was serious about this is shown by the many parts that have already been produced, which are now probably hard to find. So keep an eye out. Maybe you'll find something at the dealership that will end up in your display case.

By the way, there was already a brochure!