Depending on what you want to spend, I'm very pleased with my new rear coil springs from Coil Spring Specialties.

I saw William today (MTUpower) and he also agreed that the SDL now sits too high in the back. So, as planned, I will get the next thinner rubber spacer for it.

The ratio of spring length to increase in body height is 2.5:1 on the SDL. It doesn't take much to raise the vehicle 3" if you really want to.

If you wish to get away really cheap, ask CSS if they can "pull" your older springs out so that they are longer. Might be possible and would save you a bunch of money over new ones.