Some parts are already not available for Older-than 2000 model vehicles. There's already stuff for my 2004 Tiburon that I literally cannot get anymore. It's junkyard part, or go without.
This is true for virtually every pre-2000 vehicle, and some that are newer than that. 10 years ago, it was true for every 1990 vehicle, etc. That's how it has worked forever.