For 1987-1989 GMC R2500 Rocker Arm Nut Dorman 59121NJRZ 1988 7.4L V8

For 1987-1990 GMC R3500 Rocker Arm Nut Dorman 85829BZRR 1988 1989 7.4L V8

For 1987-1990 GMC V3500 Rocker Arm Nut Dorman 78746BQDF 1988 1989 7.4L V8

For 1989-1990 Chevrolet R2500 Suburban Rocker Arm Nut Dorman 96459NKJX 7.4L V8

For 1987-1990 GMC R2500 Suburban Rocker Arm Kit 87663GNVW 1988 1989 7.4L V8 OHV

For 1988-1990 GMC G3500 Rocker Arm Nut Dorman 81127QWRC 1989 7.4L V8

For 1987-1990 GMC R2500 Suburban Rocker Arm Kit 33441VQQT 1988 1989 7.4L V8 OHV

For 1989 Chevrolet R2500 Rocker Arm Nut Dorman 65828HFNG 7.4L V8