In addition to the narrow axles, lap belts instead of the 3 pt seat belt. Slightly different fitting of wood sideboards(different (size/shaped spacer where it attaches to roll bar). Pretty sure non-venting side windows on 81's (please correct me if I'm wrong here) which leads to non-venting compatible dashboard. Last thing I can think of is that your transmission options change as you get into later model years. I'm sure there are a few other things outside of decal differences and dealer installed accessories that I am missing too.