aftermarket
noun [ C ]
COMMERCE, PRODUCTION (also after-market) uk/ˈɑːftəˌmɑːkɪt/ us/ˈæftərˌmɑrkɪt/the selling of new parts for cars that have already been manufactured:
Aftermarkets for automotive parts in North America are booming.
The auto-dealer was looking for after-market auto parts.