I'd imagine it's the same as this right here
:
http://www.car-seat.org/showthread.php?t=155750
This. Its the whole headwing piece, foam glued to plastic.
My pic in post 15.
Apparantly some XTSL's have the 'old' headwings and some have the 'new', but we havent yet figured out what the 'cut off date' is for when they switched styles. My seats have DOMs of 10/09 and 11/09 and both have the older headwings. The XT's I guess have the 'old' headwings... but Im not 100% sure on that, I guess they could have updated those too?
I complained to SKJP (I got Russ actually) b/c ds's headwings riding up and bugging his upper back, and they sent the new ones. I didnt realize they were a different style until I saw the above post and went and checked. But I think the new ones will work better because of the way the bottom scoops out. It also looks like it goes lower.
I think I should call and double check to make sure its OK for me to mess with them, I really dont want to compromise the seat in any way and I might wait until next week when my dad is back in town so I can see if he has the right tool.
ETA: in my siggy pic, the headwings are all the way down, but if we ride around for more than 10min, they end up riding up 3-4", putting the bottom of the headwing closer to his eye level, which is too high! I guess because he is a funny height, his shoulders are just a tiny bit above the 3rd slot, but he has a really big head!