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My 94 940 also stated C in the chassis code for the rear spring, which refers to #6819404. This spring is used with shock absorber #1329500. Your #1273977 spring is meant to be used with Nivomat absorber - a self levelling system for the rear. This from blue Volvo Pocketbook. I'm currently using #6819404.
Volvopartswebstore is correct in stating sedans also use #1273977. Its meant for sedans with Nivomat. Can't comment on wagons using #6819404 but the weight differences between sedan and wagon is around 30 to 50kg depending on tail extension and accessories. This refers to the weight of whole car. Nowhere in the book only the rear weight is stated so as to facilitate choosing springs for the rear.
One thing is clear about the IPD spring is for owners who haul loads of cargo at the back. It is an aftermarket item. Could be used for both wagon and sedan. Up to owners to experiment.
Amarin.
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