XC40 Retrofitted Subwoofer vibration

[Zoomug]

Hi, I have a 2019 XC40 and I have retrofitted the OEM subwoofer into the rear n/s behind the trim.

What I was wondering if there is any sort of rubber mount/insert between the mounting bolts and the car body 

so that It doesn't vibrate the rear of the car like its doing now. 

Sounds noisy outside, vibrating the rear light cluster etc.

Thanks

Dave

[sdca_xc40plus]

I'm planning to do exactly this installation on my 2024 XC40! Did you figure out what caused your vibrations? Any photos of the installation / process of removing trim and panels etc - I'd be very interested in any input.

Thanks!