Paul - I looked into it when I had my 2007 M35x. I wanted to have a hitch for a bike rack, but couldn't find a decent option. I then found one from Curt that fit my wife's Lexus ES350 and it took about an hour to install with no cutting, drilling, etc. I ended up going that route and bought a Kuat bike rack. After getting my Q70, I looked again and the option looks better, but it requires cutting plastic parts under the car to make it fit. On the Curt site it says: Installation Notes: No drilling required for installation, Underbody panel(s) and/or fascia must be temporarily loosened or removed, Trunk access required for hitch installation, Underbody trimming required (not fascia)
Here is a link that might help:
m35-trailer-hitch-t523342.html
I end up using a trunk mounted Thule rack with my Infiniti M35
Kerry