Unfortunately time takes a toll on your driver's seat and it needs attention to offer comfort as it used to. If you want to keep it looking original. First option is to remanufacture your original seat to the same specification as was original when first purchased.
In SeatsRUs you can find replacement seats, parts and accessories for Land Cruiser, aftermarket seats for 70,75,79 series Land Cruiser and bucket seats. If you are looking for extra comfort perhaps the option of a new seat manufactured by Fasp Italy is what you should consider!