I don't know if anybody has already posted this? Sorry if this was already known.

motorsport.tv now have the rights to the Duke video archive. That means, among other things, video reviews of all WRC rallies between 1985 and 1991.

Those who have acces to the cable channel can spot them sometimes in the boradcasting schedule. For example during the coming Tour de Corse they will broadcast the 1986, 1988 and 1991 editions each day at 23:00 (and repeat later at night).

They also have an online streaming service. There they have currently WRC 34 videos uploaded. They upload new ones every few weeks. Here you can find all the classic WRC events that are currently uploaded: https://motorsport.tv/program/world-rally/196

It is a pay service but you get a one month free trial if you register now.