converting Textures

Hi, I downloaded a paint that I really like but it is for the standard wheel version only. I have converted it to the tundra tire version and it all looks great except that the paint was for one of the planes with the window in the lower door and the tundra version doesn't have that option. I now have a great paint job but I have a black square where the above mentioned window is supposed to be. I don't own the standard tire version only the bush version. Is there any way to fix this?

Mark