Let’s call them window sliders

That's the same color of glide as the ones that have been in every 70 Dart I've disassembled (half a dozen) - given that the old ones were yellowed and brittle with age. The plastic of the original seals (not the glides) were clear plastic with black flocking. These ones in black plastic are currently the only game in town and the kits provide enough material for both sides, A or B body - everything with a vent window. Some of the doors I've disassembled the seal had gotten brittle and the part closest to the channel was in pieces in the bottom of the door., some were so degraded that the black flocking was worn off and all that remained was the plastic part of the seal.