OEM Genuine Nissan rear differential cover gasket for Datsun R200 rear differential. The R200 came in later 280Z cars but has also been transplanted into all years of Datsun 240Z and 260Z over the years. The differential cover bolt pattern is different from the R180 to the R200 so look at picture to compare with what you have.
*SeePT# 800-250 for aftermarket gasket.