Kent has learned that you really can not tell how good your v belts are by just looking at them, especially if they are over 15 years old. Kind of like old tires - they may look good on the outside. You really have to remove them to inspect them thoroughly, and if you are going to do all that work (which is considerable), you might as well install new ones. These are Continental belts. The very best for your 380.
Product Details
IMPORTANT NOTE ON VIDEO INSTRUCTIONS: The instructions were filmed changing the belts on a 560SL. The arrangement, installation, and tightening are the same, but you may notice some slight differences in the actual access to the bolts at the adjustment points.