Where to buy Graco car seat/stroller replacement covers?

Our Graco travel system was left out in the rain overnight and now the cloth parts have some black spots, which I suspect to be mold. I’ve washed them, but the spots are still there and I think I’d rather just buy new. Does anyone know where I can order these? Or in the alternative, does anyone have a trusted method for killing the mold so it’s safe to use around baby again? Thanks.

SEAL