Rear brake caliper question

    looking at this 2015 parts list...


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    which number is the complete Caliper. #1, #5 Or #6....and why 2 numbers with 5 & 6.


    I don’t want a rebuild kit....I want the entire unit.


    I found the answer to my brake failure light.....over the winter brake fluid leaked out of the caliper somewhere. It’s eating the powder coating off the rim.

    while that’s seems like a Really good idea...But looking at the different part numbers....for some reason they changed things mid year....one site I looked at listed a VIN number under the part number....my local GM Dealer will only order parts if you give them a vehicle vin number....I have 4 GMs....No guessing, no looking at the phish picture...No order without the VIN.


    so at this point I’m calling the dealer to see what they say.....I’m expecting to give him my VIN..


    this could be the issue with the plastic dashboard piece...

    part 1, 5 and 6 are all for the entire rear caliper. There were other part numbers but the new part number is shown in red, which is the same number for all 3.