This shift boot, designed to replace OEM part S09-6000, is compatible with Peterbilt 377, 378, and 379 series trucks. It has a diameter of 7.25 inches. It also fits Automann part 562.7751 and Peterbilt part S09-6000. The product comes with an 18-month warranty, valid for one year or 100,000 miles after installation, or 18 months from purchase, whichever comes first. The warranty covers defects in material or workmanship but excludes damage from misuse, misapplication, or accidents.