For 1990-2009 cars

Application | GM SPO Group Number
--- | ---
Catalytic Converter Heat Shield | 3.690
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 Muffler | 3.701
Exhaust Muffler Heat Shield | 3.705
Heated Oxygen Sensor | 3.682
Three-Way Catalytic Converter | 3.685