Stupid Window Seal Question

Can anyone tell me specifically what seal this is ("circled in the picture") that goes in this channel over the rear window and door window glass? I need to replace this particular seal because the one on my car is installed wrong so that the glass rolls up on the outside instead of seating in the rubber, and that has damaged the seal. I have looked at different vendors, but it is not clear what piece I am actually looking for. Any help would be appreciated. Thanks.

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