exploder

iTrader: (1)

Ok, so I was putting on a Racetronix pump on a buddy's vette today and I somehow broke the solder on the blue wire that goes to the fuel sending unit. I wanted to just solder it on, but the piece of material it is on is flat and there is nothing to solder to. It actually has a perfect little square piece that is still attached to the solder that pulled off with it, but I can't figure out how it was held on in the first place.

1. Can I solder and fix this in some way?
2. Does anyone know the part number for a new one?
3. Can anyone suggest a place to find one?

Here is a pic of what we are looking at.