This optional adapter bar can accept one Clek, Nuna, Maxi Cosi or Cybex infant car seat to be used on the 2016-2021 Indie Twin. This adapter is not compatible with 2015 or prior models due to frame re-design. Seat fabric removal is not required for use, just an option. Compatible with: Clek Liing or Liingo, Nuna Pipa Lite R, Nuna Pipa Lite LX, Nuna Pipa Lite, Nuna Pipa, Maxi Cosi Mico Max Plus, Maxi Cosi Mico Max 30, Maxi Cosi Mico AP, Maxi Cosi Mico, Cybex Aton Q, Cybex Aton 2 and Cybex Aton. This car seat adapter has been tested with the listed car seat models manufactured from 2016 and later.