You can use the cab from a pickup, or larger conventional, but you'll have to disect the cab where it's put together at the factory. A cut can be made at each front windshield post,near the top & another at the loweer back floor section.The floor, & cowl areas of a COE, are different. you'll be using about 3/4 of the cab, minus the floor section, & cowl. Hope I haven't confused you.