@Odisaodi:

Manufacturers only have a parts supply for a given vehicle for a projected 10 years or so; they are not concerned with you being able to purchase service or body or trim parts for your 2001 Lexus LS430, they want you to purchase a new 2021 LS500

Aftermarket companies might make brake pads or spark plugs or filters for that LS430, but no way in hecc are things like window regulators, gas door release levers, or moonroof cassettes available; one needs to scrounge eBay or wrecked cars for such items.