NHTSA ordered recalls are for "life of vehicle" not how many owns it.
In fact Fiero Pinto and other recalls are still valid but good luck trying to get a dealer to touch them.
No car co will keep parts and recall parts/kits forever. Recall parts can be limited run parts and easily run out. Even if they had parts, After 15-20 years the money and space to store old parts that won't fit new models eats bottom line so GM lets them go out of inventory.
See my Cave,
Do You Recall?------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave