Question about 70 Z/28

[Jacsey 70Z]

This one is tough, there isn't a lot of original cars to go by and the assembly manual I believe shows plastic straps as does the jacking instruction label on the trunk lid.
My car has the rubber like you show in your picture, but you never know what the dealer added for a raddle or the owner. But I'm sticking to what mine has until I have more proff.
It is interesting the foam one that was in the car, would like to get a better look at this one, never seen one like that.
Also would like to know more about the car.