4 were modified with the P-1000 Vulcan (1 was being modernized before cancellation) along the 675MKV project.

9 were modified with the P-500 Bazalt along the 675MK project.

1 was modified with the Bazalt along the 675MU project- difference with the MK was the fire control system.

Source: Deepstorm.ru

http://www.deepstorm.ru/DeepStorm.files/45-92/nsrs/675/list.htm

Thank you very much for your kind assistance