This is a Backing Plate Set for your GM 68-72 A-body (Chevelle GTO, etc..) 67-69 Camaro Firebird and 68-74 Nova Heavy Gauge like the factory with Zinc Coating.
Fits
67 68 69 Camaro Firebird
68 69 70 71 72 Chevelle El Camino GTO Lemans Tempest Cutlass Skylark GS
68 69 70 71 72 73 74 Nova