rubber insulator for upper radiator mount

[richtell]

Can a reader help direct me to where a small rectangular rubber piece- maybe more than one is required- called "rubber insulator for upper radiator mount" in the Pelican parts catalog, goes on the car. The part number in the catalog is 17-20-1-719-414-M200
I have a 99 M3 convertible, and have the old radiator out of the car. I did not see a similar part on the old radiator or shroud.

Obviously this is my first go at radiator replacement. While I am waiting for an answer to my first question, and for parts to arrive, the car is still on jack stands, placed on the frame rails where the 4 "hockey pucks" used to be. Is there any damage possible to the convertible by leaving it on jack stands for several days? I have opened all the windows, the trunk lid and of course the hood.
Thanks