M-Sport had previously announced it will field four-time WRC champion Sebastien Ogier alongside Ott Tanak in 2017.
Ogier and co-driver Julien Ingrassia will compete in a Red Bull-liveried Ford, while Tanak and his new co-driver Martin Jarveoja will run a different, "geometrically-inspired" livery.
The final designs for the two cars will be showcased at the Autosport International Show in January.
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