1941 GMC Trucks Safety School Bus Chassis Sales Brochure with 5 Models Spec Sheets. GMC Safety School Bus Chassis. GMC offers 10 school bus chassis specifically designed for school bus service...featuring economy, dependability and safety. A bus for every capacity requirement...built by the world's largest manufacturer of motor coaches. Inside displays some of the features with descriptions. Back highlights GMC built Super-Duty Valve-in-Head Engines. Color coded spec sheets: Green - Models CCS-304 and CCS-305. Brown - Models CCS-356 and CCS-357. Blue - Models CCS-406 and CCS-407. Orange - Models CCS-457 and CCS-458. Red - Models ACS-507 and ACS-508. Condition: 1941 handwritten in ink on cover of brochure. Small tear and holes in cover where you can tell a staple had been at some point. See pics.