I can't believe it's not there!
ALL 4Runners are like that as the foreign counterparts use the same body parts and that is their passenger side, so the holes and hardware are already there.
Go to the dealership, order a passenger side "oh heck" handle from your year model and color interior, the one above the door, not the one on the molding by the windshield as it is a bit longer, and screw it onto the other side. Any IDIOT parts person can find this for you and will know exactly what it is if you tell them the "oh heck" or "oh $#&$^#" handle. Cost me $15 from the dealer. I don't use it for "oh heck" as I prefer to keep both hands on the steering wheel, but I really need it these days to pull myself up into my rig without breaking something, not on the rig, but on me...oh my aching knees.
Simple fix.
:guitar2: