Fits most Kenworth sleepers with round cornered doors manufactured in mid-1986 and after. Does not fit trucks with 11-5/8" frame rails. The CABMATE MODEL KWS60-A fit most mid-1986 and newer Kenworth Sleepers with round cornered doors. It replaces the original sleeper mounts and isolators, Kenworth Part No. K235-1420 and Kenworth Part No. K235-1617 and M500-7014R. This unit DOES NOT work on trucks with 11-5/8” frame rails.