cowl induction seal

[bbjohnny]

I have a couple of nos cowl induction seals but they have both separated at the seam. So I bought a supposedly nos one that was still in tact from a guy but it has the tape on both sides of the seam of the seal. My nos ones just have the tape on the outside. Anyone ever seen a GM seal with tape all the way around the seam or is it for sure a reproduction? Also, did the born with seals have any black tape? Someone mentioned ribbed lines, are they on any of the seals? Thanks!