What Rav4 comes w/o roof rails? Don't they all come with rails?
Some may not come with x-bars.
There are four metal brackets that are bolted to roof channel using nuts under headliner. For low rails, the rail and x-bar are bolted to this bracket top side, the rail also uses plastic stab-lok clips and some sticky tape up front. The high rails are different, the rails themselves are bolted to the roof using similar brackets, the the rail & brackets are one "piece". Installing either on a Rav that has no rails at all (and no holes) means drilling holes and dropping headliner, of which the holes would need to be in perfect location.
But what Rav comes with nothing?