SCC part number ZT735. For tire sizes: 235/55-20, 235/65-18, 235/70-17, 235/75-17, 235-16, 245/50-20, 245/55-19, 245/60-18, 245/65-17, 245/70-16, 255/45-20, 255/50-19, 255/50-20, 255/55-18, 255/55-. They may have been in storage anywhere from 1-30 years.
Z Tread superior to the parallel cable type. I saw many people struggle up hills with the parallel type, especially with little to no snow. The Z type chains eliminate the ball bearing effect. Worked great in all conditions. Used then for a Lake Tahoe weekend in snow and ice and worked great. Very easy to install in snowy/ windy conditions. I did practice once in the garage first. Bring plastic or cardboard for the ground. It took my 15-year old daughter and I 5 minutes per wheel on and 2 minutes per wheel off. The rubber tensioners kept them tight as a drum. Product advertised as used, but appeared to never be installed.