IMHO, you may only need to change the mattress, if this is the case, then I would go shopping for a replacement mattress and see if you can find one that fits the existing wall bed and has the firmness you like. I have no idea if any of the sleep number products would work, we used one for around 10 years, I like sleeping on a rock and my wife likes clouds, a king size with separate controls was perfect. If a sleep number queen size will fit, then you will have an ADJUSTIBLE mattress for you or your guests.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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