1987-1990– the10.5″X 0.870″ rotor. In Dakota lingo it is known as the 14″ wheel rotor. This rotor has a 5 on 4.5″ bolt patten with 1/2-20 studs and will narrow the track width to 59.5″. You will need the correct caliper bracket for this rotor but the caliper itself is the...