Ordered a new bike that comes with rear post mount, I am going to be swaping some of my gear to the new bike. It comes with 160 rotors and mine are 183 but my adaptor is the normal side mount and this one comes with post mount. Question is do I just use the same post mount adaptor I would use if I was going from 160-183 on a shock post mount system. I havent seen any rear post mount adaptors so I am assuming it uses the same as what you would use on your shock.