Replace the rear springs , there are many variations, it would be in your best interest to take one out and send it to a spring manufacturer and tell them you want it to sit higher, I work at a dealer for 30 years been there done that with that exact model, we had to order twice and still was too low , finally with taller rubber pads it was right . It would be easier just to get them measured and made, they do just sag over time in the rear