On the 767-200 image I see no SSR antenna, but since that TCAS uses the transponder I guess that are sharing the same antenna. Am I right ?]1
The SSR antennas are labeled ATC L and ATC R (two at the top, two at the bottom). Both SSR and TCAS systems use the same communication protocol and use the same frequencies (1030 and 1090 MHz). They could share antennas.
However for best performance, SSR antennas are usually omnidirectional and TCAS antennas favor some sector, e.g. the front sector, usually by taking advantage of beam forming.
On this B767-200 picture, TCAS antenna is the flat one at the front, and the yellow SSR antenna is a bit behind (only one):
See the full and higher quality photo by Ramon Jordi
Another airframe with 2 SSR antennas:
See the full and higher quality photo by Temo Madrigal
I was not able to find a good view of the SSR antenna on a B767-200, but on this A320, the two side yellow SSR antennas are more visible (as well as the single DME antenna behind):
A320 SSR antennas, source