I believe the reason the taller rock guards are not OEM on Bambis is that they would cover up the Bambi badging (in your case the International badging) forward of the awning arms on the curb side and in the same position on the street side. Our 2006 19' Safari SE has the shorter guards. I think if you look at yout unit, you'll see the reason they didn't come with the taller guards.
We have a few little dings to the area above the guards, but somehow they don't seem as awful knowing that they got there through towing and enjoying the trailer. The guards take the brunt of the flying stones, thankfully. We have mud flaps on the truck which seem to help with the flying stones...but nothing is going to protect it completely...flying stones can come from other vehicles, too...
TB & Greg and Abbey Schnauzer
AirForums #21900 . Membership Chair, 4CUnit #3954
Travel Log: AZBambi...On the Road Again