The Servo / Booster Part Number is 47210 - N4300. I don't think this will fit the very earliest 69/70 Zs so check first - the bolt pattern may be different. Its the only genuinely new Nissan one that I have ever seen and I doubt that you will find another new Nissan one for sale anywhere in the world. I only have this one so be quick!
The item "NOS Datsun 240z 260z 280z Brake Servo Booster Genuine Nissan Part NEW IN BOX" is in sale since Sunday, January 17, 2021. This item is in the category "Vehicle Parts & Accessories\Car Parts\Brakes & Brake Parts\Brake Servos". The seller is "bishopsrock" and is located in Sale. This item can be shipped to United Kingdom.