8640600001 - Polisport child seat mounting system for oval and round bicycle frames from 28 to 40 mm. Compatible with selected Bubbly, Guppy and Groovy models. - 5604415080838

- Polisport child seat mounting system for headset tubes 22–40 mm, compatible with Guppy Mini and Bubbly Mini seats. - 5604415027772

8630100001 - Polisport Child seat mounting system: Frame mount 24-40 mm, fits seats Bubbly maxi, Guppy maxi, Koolah, Boodie, Bilby and Wallaroo - 5604415025935

8632900028 - Polisport headset tube mount for 28–40 mm tubes, compatible with Guppy Mini+ 2022 child seats. - 5604415124181

8632900021 - Polisport mounting plate and screws for frame-version Joy and Koolah child seats, connecting the seat shell to the metallic tube. - 5604415075513