Right - Passenger Side Rocker Panel Backing Plate fits K3500 1988-2000 58RHBM

79HW31D Right - Passenger Side Rocker Panel Backing Plate Fits Chevy K3500

92DQ38Z Left - Driver Side Rocker Panel Backing Plate Fits 1988-2000 Chevy K3500

Left - Driver Side Rocker Panel Backing Plate fits GMC K3500 1988-2000 59KMPH

55CG29B Left - Driver Side Rocker Panel Backing Plate Fits 1988-2000 GMC K3500

Right - Passenger Side Rocker Panel Backing Plate fits K3500 1988-2000 75PSRH

For 1988-2000 GMC K3500 Rocker Panel Backing Plate 61653NW

For 1988-2000 Chevrolet K3500 Rocker Panel Backing Plate 91649SW