Solid, beautiful 1973 Buick Riviera Gran Sport boattail in the making..., rebuilt original 455 engine. Began restoration, no time to finish. Extra parts, please see pictures. Recently appraised (June 2023) and would be happy to send copy of appraisal upon request. I also have a report from the Sloan Museum VIN Documentation research service and it is shows this vehicle was loaded with options including GS package.