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New isolators will obviously make the biggest difference, but you can add packers to add just a bit of extra ride height.
Here is my upper spring pan with newish yellow foam isolator and two 6mm packers. The dirty grayish one was existing, the dark black one I bought new and added to the stack.
Well, that doughnut has completely disintegrated so the chance is you will gain more than an inch at the wheel arch and it may actually fix your sagging
My springs measure 35cm both old and new , measured like that:
