heck the one I am using I found in the spares! I like the CAMCO that Jimmy posted but make sure that you check the tension on the screws again after using for a few days as a precaution.
I think that this is an item that warrants more attention. When I looked at my coach, it was clear that the connectors had been loose and caused some heat build up.
Now the wires are trimmed and the connections re-tightened, but I will replace as soon as I get a chance.
If I had stayed at the rally, I know that I would have been able to find some supervision to ensure that I did it properly!