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Are the metal covers for the windshield pillars the same for a '70 Cutlass S and a '72 Vista Cruiser? Eyeballing these ones, they appear identical (black is Cutlass, blue is VC). The only difference I've noted was a rubber seal running the length of the VC cover, which I haven't seen in a Cutlass before. Should I use the rubber seal in my Cutlass or omit it?
Unless the rubber seal has a mechanical connection - like holes or a slot in the metal pillar, they're likely a previous owner's add on to reduce noise or water ingress.
Speaking from authority as I've done exactly that on my big cars. If it's just an adhesive backed piece of foam rubber, it's probably from 3m or Trimlok stuck on by somebody before you.
Personally I like having the extra seal,I believe it helps my big cars keep quiet and dry. Or at least I can say they're louder without the added rubber.