It also depends on which set your looking for? They came with standard and custom set, custom was brushed Stainless steel standard were hard plastic.
Good luck they are hard to find and expensive, search ebay.
70 RS/SS, Green Mist black vinyl top. 4 bolt main 383, CNC Canfield heads, Comp Cams XR282 Hyd. roller, Comp roller rockers, Edelbrock RPM Q-jet manifold, Cliff Ruggles Modified 750 CFM Q-jet, 1 5/8 Jet coated headers, 2.5 inch mandrel bent "H" pipe exhaust, Flowmaster delta flow 50 mufflers. 2200 stall converter, 373 Posi rear.
2006 Impala SS.
Patterson TWP. PA.