Graco PD265358C Owner's Manual page 52

ADDITIONAL INFORMATION
(continued)
Head Support & Harness covers (certain models)
Only use this head support on this child restraint.
Never use this head support on any other product.
To get the full benefit of the Safety Surround features, we strongly
recommend that the head support is used until the child is large
enough that his or her head is aligned with the built in Safety
Surround features at the top of the seat.
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