Ok so DS has had his nautilus for about 2 years. Today when buckling up to leave for Grandma's house both prongs on the chest clip broke off. Do you know if I can buy a replacement clip from a store. I check Babies R Us but they only had the old style infant seat clip which I don't think would work. Do you think that Graco would just replace it for me since I don't think that a clip should fail under normal use after 2 years when I am suppose to be able to use it in harness mode for 6. Good thing he can ride in a booster well since we are driving to the beach on Sunday and that is his only harnessed seat.