Should there be something between gas tank and trunk floor? On the straps?

Gas tank should be here tomorrow. I have the straps cleaned up. What I dont know (remember) is if there was some sort of rubber strips between the straps and the tank, and if there was something between the tank and the trunk floor. Related to that, is it a good idea to have something between the trunk floor and the tank? Looking to avoid the rot that I just replaced.