I used to have a Giardiniera and being an estate I know that its rear suspension was uprated from the equivalent saloon. That is common to most manufacturers. I would imagine that making the 126 BIS with a rear loading facility they uprated the rear end slightly from the original air-cooled, but don't quote me.
Remember that although two springs may have the same physical fitting dimensions, their spring rate may well be different giving a harder or softer ride. Typically the steel used will be thicker for the harder spring, but it's possible to get the same effect using a different grade of material.
To be sure, why not check out the official documentation available in the Subscribers' Section of this forum ?
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