What are parts not made by the original manufacturer called?

The term that refers to parts not made by the original manufacturer is "Aftermarket Parts." These components are produced by companies other than the manufacturer of the original equipment and are often used as replacements when the original parts are no longer available, too expensive, or when the buyer is looking for an alternative.

Aftermarket parts can vary widely in quality and price compared to original parts. They might be designed to meet or exceed the specifications of the original components, providing a cost-effective solution for repairs and replacements. This flexibility allows vehicle owners and repair shops to choose options that best fit their needs and budget.

Understanding the distinction between aftermarket parts and other options can help in making informed choices for maintaining or repairing vehicles. For instance, while original parts are made by the manufacturer and counterfeit parts are unauthorized replicas that imitate original components, aftermarket parts are legitimate alternatives that can serve similar functions often with different pricing strategies.