They're there...  you've got to kind of feel them behind the mesh, or you might be able to reach up into the seatback to find them.  Take an X-acto knife and carefully cut access to just the hole.  You can also take one of those butane fireplace lighters and "sear" the edges of the holes.  I would suggest adding a couple of washers to the top bolt attachment, to angle the bottle holder away from the seat a little, so the water bottle doesn't abrade the fabric up at the top of the water bottle.

RANS has an instructional piece on their website regarding the installation.  You should be able to feel them near the bottom of the back part of the seat.