keith ygm
it has what you need to get the part and install it
the cat dealer should of been able to find this and help you but sometimes you run across those unwilling or just too lazy to do what is necessary to make customers happy unfortunately.
As for that replaced contactor if you can see if you can find out if it is an aftermarket contactor or a OEM part. If it is aftermarket replace it with an OEM part... these aftermarket parts are substandard parts and can cause more problems than they solve sometimes.

I hope this helps

good luck