Ahh right, the 4x4 has that as well. I bolts to the top of the engine mount which is different from a 2wd. The 4x4 mount has the two mount holes offset and looks different to the one in the drawing. You'll probably just be able to use your original 2wd mount. I've an RS 500 inlet in my 4x4 and I use the 4x4 mount.