The guide I was following:
OBC Hack PDF
Note, the parts list on the guide is for pre-2001 cars.
I think the connector/cover info is also old - Jeff @ Sunset sent me: 999-650-513-40 (about $4)
I am going to look into buying the molex pins bulk - I ought to be able to build it for less and without splicing if I can buy the connectors by themselves.
Stay tuned.
-james