Stock rim diameter is 14 inch, and I think the width is 5 inch. Tire size is 195-75/14
Rim options over the years have not changed a whole lot. Basic steel wheels with two options of hub cap, chrome or painted, have been the norm. The hubcaps changed a couple of times in minor ways over the years, but the plain steel wheels stayed basically the same. White spoke wheels came in as an option sometime after 76 I think. In 1976 there was a special edition bicentennial model that came with white spoke wheels with heart shaped cut outs instead of the usual triangles. There is a link in
this forum thread to a picture of what they look like.