Original GM molded rubber weatherstrip with part numbers molded in surface. One LH & one RH. Supply rubber, not a dried out old prune like Pelosi, Hillary or Wholittle.

I don't know for sure if these can or cannot be used on 56-59 models unless the later style header weatherstrip is used. Something tells me that 56-59 had a one piece header, however I know of no reproduction for that part. And truthfully, I forget more Corvette trivia with each passing day. It's not dementia, it's lack of interest in Bucks chasing points.