You wont need to do anything, just take them to the shop to get mounted, they may need to get tweaked out ever so slightly, but in most cases the "85mm" brake is a bit bigger than "85mm" - we are talking about millimeters here.
Hahahaha. First of all, the first guy was joking when he said OP needed 130mm brakes. Second of all, how did you not realize that the guy said "joke" about what you said, not the cm/mm mistake. Third of all, if you aren't joking about all this, you know nothing about bindings. Fourth of all, I will feel very stupid if this is all a joke by you, and I took it seriously.