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Anyone know where to buy or the best way to reconstruct the diaphragm in my seat's backrest. Other posts have the original built by pirelli but no sources. It is unreinforced rubber, almost looks like butyl now. I'd rather not create a lawn chair inside my seat if I can do better with rubber sheating.
 

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I'm not sure if this will help, but I bought an inflatable lumbar support made for a Miata and it installed just fine in my S4. It had a manual inflation bulb and was very reasonably priced when I bought it.
 
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