etap front derailleur mount

etap front derailleur mount is flat. used to be rounded. are these new model? or do i need some kind of shim? thanks http://

Image: https://farm8.staticflickr.com/7846/45844892225_e3ca834a73_c.jpg (https://flic.kr/p/2cRa4fi) 20190115_201044 (https://flic.kr/p/2cRa4fi) by jerbax18...