That is just the heater blower switch sub-harness. It plugs into the main harness on one end and to the blower switch on the other.
If you are adding a new heater or converting from a NAS 110 style dash you will need to make a new harness that has fused power and the rest of the wires to run the blower motor. LR does not sell a heater harness, it is made into the main harness.
The power goes to the blower itself and then it gets its ground via the switch for the 2 different speeds.
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ECR is not a parts source. We are not in the mail order business.