G'day Matt,
Roverparts in Ballarat advertise diaphragms and foam seat bases to restore seats, but a bit too expensive for me at the time, so I attempted a temporary fix that has lasted well. The diaphragms split along the black stretchy bit; I sewed a length of seatbelt webbing over the split, top and bottom, using an industrial machine. I am sure a local trimmer could do that quite cheaply for you. That gave a good base to work from. My car has seat covers, so I cut some 50mm foam to fit under the covers on top of the original seat base, tapering the edges so it was only thick in the middle and at the rear where it had sagged the most. An electric carving knife is good for shaping foam rubber. It took a bit of trial and error to get right but there were no complaints on our recent 6000km Simpson trip, even from the better half. If you haven't got seat covers, you could try putting the extra foam between the original base and the diaphragm.
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