When I bought the Nissan back in 2007, I went looking for the usual suspension, protection, and recovery mods. I found little, but did spot all the nice things ARB was doing in Australia for the Navara, so called my friends up at ARB. Just coincidentally, they were looking to offer some product for the US Frontier, but didn't have a Frontier available, so asked if I would let them use my truck to test fit the Australian Navara products. They started with the springs and shocks, and over the period of a year or so, progressed through the front and rear bumpers, and eventually the skid plate set.
Some products bolted right up, and others needed some minor modifications. The frame horns differ between the rest-of-the world trucks and ours because of US crash requirements, so new front mounts had to be designed. The frame horns also affected the bumper to front skid plate filler panel by a fraction of an inch. So, the front frame horns are really the only difference between our Frontier and the Navara. Later, I ordered a set of Escape Gear seat covers from South Africa. They had never sold any in the US for a Frontier, so asked for interior photos and some measurements, and we found that the interior is an exact match as well.