These fender patch panels are located in front of the wheel on the driver and passenger side. The driver side part is based on the 1967-1968 fender and to match the 1969-1972 models the part will need to be trimmed at the line in the picture provided.
Lh Rh= driver and passenger side
1967-1972 Chevy & GMC pickup
1969-1972 Blazer & Jimmy