Amazon.com: Car Seat Adapters for Ridge (Maxi-COSI®, Nuna®, Cybex, BeSafe®, and Joie) : Baby
mixx ring adaptor
Nuna PIPA™ Car Seat Adapter For BOB Single Stroller
pipa™ series car seat adapter for Bugaboo® Fox™
Amazon.com: Britax Infant Car Seat Stroller Adapter for Nuna, Cybex and Maxi Cosi Car Seats, Compatible with Britax Single Strollers Only, 2 Count (Pack of 1) : Baby