Sorry you haven't found these yet.
Given that in your previous thread, your Nivomats themselves appeared to be very tired at best, have you considered putting 914100s on? These are the coils for the non sport chasis. It's the Nivomat that provides most of the ride height and the coil is described as an 'assister' in your set up. A longer, stronger, 'assister', asuming it fits, might actually be a better option. You would need to get an expert opinion as to whether or not they physically fit, however.
Good luck.
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