The very earliest 240Zs (to 06/71) used a different mount and crossmember and the driveshafts were angled backwards. This was quickly revised to parallel shafts and the later mount. As far as I am aware, the early mount is now no longer available and most cars will have been converted to the later configuration to bring the driveshafts into the preferred position...
The early moustache bar was also a different part number, but the later revision was listed as a "conditional" retro fit for the early version
The plate is not shown as a part in the parts book, but there is a substantial damper plate below which is often left off / gone missing as the years have passed.