Angry truck owner

Can’t find a tool to remove the nut on the banjo housing. According to my dealer it’s not available to the consumer so he says I have to bring it to the dealer to replace the rotors. I’ve never heard of such a thing! Any suggestions? Thanks.

How did you get the tool to remove the nut?? I’ve searched everywhere and nothing works. Today the dealer told me the tool is not for sale - it’s a dealer-only item.