https://www.autosport.com/wrc/news/1...-future-stance
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Ogier used ZF in Fiesta on gravel also, now (2019) it's only ZF who delivers dampers for Fiesta WRC, both gravel and tarmac.
Citroen tested different dampers in their C3 on tests before the season, seems Reiger fits them best. And it can be because of many reasons, as every top damper brand is different than the other, but they all are top. No sense to go into too many details here.
Another point is how driver feels for the setup or the cars behaviour. His experience etz. There´s not one answer to which setup suits drivers best. Not even brand on suspension...
It's worth changing from damper company A to B if the driver knows how the B dampers work instead of having to test all 50 models from A.