Which term best describes parts produced by manufacturers other than the original manufacturer?

After-market parts refer to components that are produced by manufacturers other than the original manufacturer of the product. These parts are typically designed to fit and function like the original parts, but they may vary in terms of quality, performance, and price. After-market parts can often provide consumers with more options, allowing them to choose alternatives that might be more affordable or provide different features compared to original equipment manufacturer (OEM) parts.

The nature of after-market parts means they can serve a variety of purposes—ranging from enhancement and customization to repairs—making them a common choice among consumers looking for alternatives to original parts. Understanding this distinction is essential for those involved in appraisals, particularly in evaluating the value and condition of equipment or vehicles that may have been fitted with non-OEM parts.