Fits most Peterbilt 359 and 379 Series conventionals. Does not fit trucks with Able Body sleepers. The CABMATE MODEL PBC379-A fits most Peterbilt 379, 359 and 330 Conventionals. It replaces the original cab support, Peterbilt Part No. 20-15951,20-13321, or 20-00621. (It may also fit older 359 Conventionals with aluminum crossmember, with crossmember substitution.) Dual exhaust requires ordering an additional exhaust bracket, Link Part No. 2899-A000. This unit will not fit trucks equipped with Able Body Sleepers.