(115-C) Serial number located on metal firewall plate. The plate also showed body type number plus the actual production number of that body type, starting with a base number of 200. Starting: body type number plus 201. Engine numbers located on boss on upper left corner of cylinder block. Starting: T-1500, Ending: 99999. (120-C, 120-CD, 138-CD) Serial number located on a metal firewall plate. The plate also showed the body type number and the actual production number of that body type, starting with a base number of 200. Starting: body type numbers plus 201. Engine numbers located on boss on upper left corner of cylinder block. Starting: X-100000, Ending: 199999. (1500, 1501, 1502) Serial number located on a metal rectangular plate on the firewall. The plate also showed body type number plus the production number of that particular car, starting with a base number of 200. Starting: body type number plus 201. Engine numbers located on left side of crankcase near starter. Starting: 395500, Ending: 449999. (1506,1507,1508) Serial number located on a rectangular plate mounted on the firewall. They used the body type number and production number for that body type. These started with a 200 base. Starting: body number plus 201. Engine numbers located on left side of block below distributor. Starting: 905500, Ending: 919999.