For 1990-2009 cars

Application | GM SPO Group Number
--- | ---
Bolt (Catalytic Converter Hanger) | 8.900
Catalytic Converter Gasket | 3.690
Catalytic Converter Hanger | 3.690
Catalytic Converter Hanger Insulator | 3.690
Catalytic Converter Heat Shield | 3.690
Catalytic Converter Nut | 8.915
Exhaust Crossover Pipe | 3.609
Exhaust Crossover Pipe Heat Shield | 3.616
Exhaust Manifold Gasket | 3.270
Exhaust Manifold Heat Shield, Lower | 3.602
Exhaust Manifold Heat Shield, Upper | 3.602
Exhaust Manifold Pipe Gasket | 3.611
Exhaust Manifold Pipe Nut | 3.613
Exhaust Manifold Pipe Stud | 3.613
Exhaust Muffler | 3.701
Exhaust Muffler Heat Shield | 3.705
Heated Oxygen Sensor | 3.682
Pop Rivet | 8.967
Three-Way Catalytic Converter | 3.685