Sealy has since been sold to Tempurpedic.
Everything they make, today, is loaded with memory foam....an upholstery material that isn't in the Sealy Posturepedic mattress you have now.
Memory foam is used to cause a mattress to need frequent replacing.
Besides being a lousy product, in terms of quality and longevity, it is also a health hazard...off gassing the toxic chemicals from which it's made.
In order to get something similar to what you have, you have to look elsewhere...NOT Sealy.
Here is a link to two sided, old fashioned made mattresses...all considerably better than anything Sealy makes...containing NO Memory Foam.
Old Fashioned made Two Sided Mattress that you can flip. Strong coil unit and NO Memory Foam. Durable for Plus Sized People. Works with Adjustable Bed Bases.
Delivery is free and there's no sales tax.