So after some research and picture to part comparisons, the parts seem to come from the 89-91 Toyota truck. It has both the one piece bumper and the one piece valence. As I recall, and confirmed from pictures I have found they line up nicely, all things considered. The factory set up has gaps large enough to park cars in, doesn't look like gp tolerances were a priority for these trucks.
That being said, I'll have to seek the person you mentioned out and see what they offer. If I ever get around to doing it I'll be sure to post the progress.
