Fits most Peterbilt 357, 375, 376, 377, 378 Series conventionals. Does not fit trucks with Able Body sleepers. The CABMATE MODEL PBC377-A fits most Peterbilt 357, 375, 376, 377 and 378 Conventionals. It replaces the original cab support, Peterbilt Part No. 20-15950 & 20-13319. Dual exhaust requires ordering an additional exhaust bracket Link Part No. 2899-A000. This unit will not fit trucks equipped with Able Body Sleepers.