Well that turned out to be a bad idea. The front mounting holes are angled, so that putting washers in there doesn't give you much tilt on the seat to begin with. And on top of that, the bolts are metric...and metric bolts have SOFT threads that just fall apart if you don't put them in at the perfect angle. Ended up having to drill and tap one of the holes and put a standard bolt back in it's place. What a PITA. I guess on a vehicle that was close to $40K new, it was too much to ask to have a tilt adjustable passenger side seat.
Wife will just have to live with it as it is.