I swapped mine when I first bought my C32, but I swapped it for another original part.
At the time I was told by the dealer that the knob and gaitor are one unit, and when I got my replacement it didn't look like it would come apart.
I decided to ask the dealer to do it when it went in for service or warranty work, and it took them seconds.
That looks like a non-original part and so you may need to butcher your existing unit to get the gaitor off it, and attach to the new one.