I recently replaced the surrounds on the bass drivers in my Proac Response 2's. I purchased the surround kit from simply speakers and they worked great. However you should watch the videos they provide as well as some videos on youtube. You need to align the surrounds carefully to avoid rubbing of the voice coils.
https://www.simplyspeakers.com/proac-speaker-foam-edge-repair-kit-fsk-6.5.html
https://www.simplyspeakers.com/proac-speaker-foam-edge-repair-kit-fsk-6.5.html