OK, got it now, I've had a closer look. They are the ordinary thickness but are upside down. What I'd remembered as a small spring is actually convoluted rubber disintegrated into separate rings.
So they do seem to be self-levelling type of some kind, so presumably do have the softer springs. If they are not then either way it needs new springs, because they sag under heavy load either from weakened springs or from failed "Nivos" which deliberately use weaker springs.
I don't commonly carry heavy loads so don't think need the extra-load shocks, I'll just get standard and fit my spare springs which I know to be good.
Many thanks.
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