I don't think any of those parts are OEM Isuzu.
The OEM Isuzu radiator is over $400+. Was yours around that?
I decided to go with a custom made all aluminum racing radiator for about $625 instead of the standard OEM one since it wasn't all that much more.
I don't have pics of my OEM boxes, but I know they were all branded Isuzu.
I do have pics of my new OEM redesigned fan blade, you can compare to. This thread has info, see post #5:
http://www.vehicross.info/forums/sho...ight=fan+blade