I just purchased an EZ track 9" power terminal with insulated gap (#44597).

It uses what look to be the same connectors that the standard terminal tracks use - the two spade-like connectors on about 3/8" centers (imagine suitable editorial comment here).

Does anyone know if there is a source of matching connectors for making my own connections? 

Can the connector lugs be directly soldered to, or are they an inappropriate material?  I know that I could buy BMan's extension wires and cut them in half, but I might prefer to use different (thicker maybe) wires.  Crimp-on connectors might also work, but I wonder about the quality of the connections.

Any thoughts?