Bolster bladders in C43 seats

[AMG KC]

Hi all :)

I managed to get my driver side seat bolsters working for one day, then they deflated, so i took the right hand one from the passenger seat which lasted two days and then also sprung a leak.

Where can i get replacements? The Mercedes Benz dealer here tells me they cant be bought separately in Australia, but im sure they must be able to be had from somewhere.

I quite like them pumped up abit, so i want some new ones!!

Thanks all :)

[AMG KC]

Can i just force in some high density foam rubber in place of the bladders? I wont need to adjust them, i like a reasonably tight fit in the side bolsters.