Up to 1980 at least standard kz and ltd frames were identical...just slightly different looks. In general, ltd meant dual disc slightly longer front, cast wheels with 16" rear with a disc, stepped seat and more chrome (actually just the headlight bucket now that I think about it) The different ltd parts have been swapped so much over the years that the differences have become blurred. Even many 1973 Z1 parts bolt on to an '80 ltd.