There was one available on 2006 and later 44DAs so I’m sure you could get one from Cummins. Installation would likely require removal of the generator All of my boats had generator sound shields installed from the factory and I could never tell they were running other than the slightest low level vibration in the sole.
I had one have after the fact on my old Silverton I did a little digging and a kholer dealer found one for me not at a boat store. 12 years after the fact