You can buy replacement wire ends - the connector body comes apart, just put the new pigtail in and solidly crimp the wire to the existing wire. I did this several years ago, not long after I bought mine.
The part number should be 61 13 0 007 445 for the pigtail, if my records are right.
EDIT: I used a watertight connector body (Metripack) to make the connection to the existing harness, but here's mine:
