Hello Joe,
We do carry the contacts for the 6 position connector 455-2352-ND. The Socket Contact for the 12awg wire is 455-2377-1-ND . The Pin contact for 12awg is 455-2349-1-ND .
If you need it we also have an extraction tool 455-2370-ND and Crimp tool 455-2368-ND that will work for both of those contacts.
On the connector 455-2151-ND the best we have for contacts will be 20-24awg and will be just the socket contact. It is part number 455-2051-1-ND.
The Crimp tool if needed is 455-2046-ND .
If you need the header it will come with the contacts already in it.
I hope this helps you out.
If you have any questions please let me know.
Thanks,
Paul Burmeister