Parts Name Inside Of Car Name Of Car Part/interior Trim On Doors?

Name of car part/interior trim on doors? - parts name inside of car

I have a 1997 Pontiac Grand Prix. The plastic strips through the gates ---- --- along the windows are cracked and fissured. --- What are they? It is difficult to make online purchases of spare parts with a description of the "little plastic things.
- Oh! If anyone can suggest where they searched for a replacement (with the exception of eBay search, the first place that I intend to find if the name is known), really appreciate it.
--- Thank you for your time!