The web filled in model 8444. I have no idea where that came from. My neighbor gave me a Grayco infant carrier. It is somewhat disasembled and modified in places, I'm not going to use it for an infant. It is to serve as my Bichons' dental chair. I'd really like to know where and how these straps and slots go together. Thank you for your time! Patti Catalina, AZ