The current cache is created in honor of Planti and Arnokovic who made this spot available, after that the conditions for the original cache, not too far away from this one, were no longer present.
In order to obtain the coordinates of this cache you need to find five numbers, A through E and plug them into the Certitude below (enter ABCDE). You will find the numbers by playing the Adventure Labcache Ballade autour de la tour Eiffel.
If you are not familiar with Adventure Labcaches check out this link.