This is the PVC cover for male spade connectors. These are used in different locations in the harness. Usually, they are mated to the female version of this. Examples would be where the Interior Harness meets the Main Harness (a Black with White tracer wire) or where the Rear License Lights meet the Main Harness (a solid grey wire). There are other applications as well. Please email if you would like the exact locations. There are a total of 4 males that use this cover on the main harness of a 65-68 harness. The second picture below shows how it connects with the female spade cover.