For 1973-1974 GMC C15/C1500 Pickup Rocker Panel Backing Plate 83724KX

Right - Passenger Side Rocker Panel Backing Plate fits C15/C1500 Suburban 87NVZS

Left - Driver Side Rocker Panel Backing Plate fits C15/C1500 Pickup 55SHFT

For 1975-1986 Chevrolet K20 Rocker Panel Backing Plate 88164ZC

Rocker Panel Backing Plate Passenger Side For 73-91 GMC Jimmy Chevrolet Blazer

For 1973-1974 GMC C15/C1500 Pickup Rocker Panel Backing Plate 16831SGWG

Right - Passenger Side Rocker Panel Backing Plate fits C1500 Suburban 98DRSN

Right - Passenger Side Rocker Panel Backing Plate fits C15 Suburban 77FNJW