I'm not sure you'll find a definitive answer on that one. I saw an unused OEM module on eBay quite awhile back that looked the same as ours, and was advertised as being for a VX, but when I called Merlin to verify the part number (it was a little different than the one listed in a parts book I had), even he wasn't sure about it. He just said that at times, Isuzu applied superceded part numbers to some parts, but that it was impossible to tell whether it was done because actual changes had been made, whether they had just been purchased from another supplier, or ???