There are three different versions of the owners manual as far as I am aware.
The 1981 version is spiral bound along the top edge, and has actual
photographs for the illustrations, whereas the 1982 version is
"saddle-stitched" (folded sheets stapled in the fold) and has line
drawings for illustrations. The illustrations are printed in black
and highlighted with a funky kind of yellow color. This is the
version that is reproduced and sold by most, if not all, of the the
major parts suppliers, though it is printed in black and white only.
There is a 1983 version, but I think it is almost exactly the same as
the 1982 version, except that it is printed in one color for the text
and illustrations.
There were different valets also for the 1981 and 82/83 models. The
reproduction valet that we sell is for the 1981 models.