1997 GMC Sonoma Owner's Manual - Page 222

Removing the Spare Tire Tools and The jacking equipment you'll need is stored inside the plastic jack cover which is behind the front seats, either on the center of the wall (extended cab) or on the passenger's side of the wall (regular cab). The following steps will tell you how to use the jack and change a tire. This is the jack cover for the extended cab. The cover for the regular cab is similar. To remove it, turn the plastic wing nut counterclockwise. Remove the jack cover. 5-24