Hey if it's something that you like and it works, then that's great. Glad to hear that you found something that works with your back. I've not had much problem with my older original seats, but everyone has a different shape and back. Just had my w113 seats redone with covers from GAHH and repadded by a furniture upholsterer that we use. The original springs were in good shape. They feel great. It's definitely possible to work with the forty year old original seats and make them look factory new, but it can be pricey. . . The cost of restoration of these seats might be comparable to the cost of many a running/driving w123 with "500,000 trouble-free eBay miles" left on it to go.

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PagodaLOVER
1967 230SL, manual
1959 180D, manual