Sealing rings for Tesla S air strut rear, 2013-16 pre-facelift models.
The set consist of three rings: A rubber (1) 'O-ring' that seals the transition and prevent leaks. A (2) 'support-ring' in metal, that covers a C-shaped (3) 'stop-ring', also of metal.
Note that the strut itself must be dismantled to get 2 and 3 in place, and that they cannot be pulled over the lower bolt attachment.
Sold as a set only.