The rear bumper design is still in development, right now we are finishing up several orders and are producing the steering stabilizer kits so we can start shipping these this week. After this we will continue working on our design which does not include a piece that attachs to the tire lowering mount but is supported in other ways. I am not sure what size tire will be able to be fitted underneath as Steve(Calmini) said there is the issue of how the Nissan bumper has a slight bubble to it to fit the tire underneath, our goal would be for a 32" tire to fit underneath but i am not sure that it will.
The other issue is in regards to the hitch in the bumper, with a hitch it might not be possible at all to fit a tire underneath...for those who just want a replacement bumper are you looking for a hitch as well or just recovery points and Hi-lift jack locations?