Here is a great reproduction of the Fairlady Z dash emblems from Japan. If you have a Fairlady, they are the proper size and fit for your Z. In addition, they are the same size as the U.S. 70-78 Z Dash emblems, the only difference being the posts are in a different place. If you are making a custom "Fairlady" and want to use this emblem, you simply need to do what Nissan had done for years when they still sold the U.S. version, that is carefully removing the installation posts from the back, and using double sided tape for the install (not included).
Datsun 240Z, 260Z, 280Z
Datsun S30, S130, Nissan Z31, Z32, Z33, Z34
1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978