Dorman Products : Announces 571 New Products, Including 60 Aftermarket Exclusives

PRESS RELEASE

DORMAN ANNOUNCES 571 NEW PRODUCTS, INCLUDING 60 AFTERMARKET EXCLUSIVES

August 11, 2021

Highlights:

• Aftermarket-firstDorman® OE FIX™ braided stainless steel flexible fuel lines for more than 2 million GM trucks add to growing category of time-saving innovations.
• Active grille shutter assembly for Ford trucks extends fast-growing line for later model vehicles.
• Other exclusives include LED turn signals for Dodge Ram trucks, third brake lights for Dodge and Toyota vehicles, and an upgraded OE FIX™ windshield washer fluid cap for 14 million GM vehicles.

COLMAR, PENNSYLVANIA - Dorman Products, Inc. (NASDAQ:DORM) is announcing today the release of 571 new replacement auto parts, including 60 aftermarket-first solutions, giving repair professionals and vehicle owners greater freedom to fix a wide range of cars and trucks.

This month's new solutions include upgraded, braided stainless steel, flexible fuel linesfor more than 2 million Chevrolet and GMC trucks (819-840). Corroded fuel lines can be tough to replace because they usually require routing rigid metal lines under the vehicle. These OE FIX™ lines are braided stainless steel over flexible PTFE tubing, made to specific length for extended cab GMC Sierra and Chevy Silverado pickups, with new brackets and factory connectors for a better installation experience. Their flexibility also makes them easier to stock on warehouse shelves, taking up a fraction of the normal fuel line footprint.

Another reliable replacement this month is a radiator shutter assembly, also known as an active grille shutter, for more than 1.5 million Ford trucks (601-336). Traditionally, when a vehicle is in motion, air flows through the radiator and cools the engine, but it also results in aerodynamic drag that decreases fuel efficiency. When the engine does not need to be cooled, active grille shutters close to restrict airflow through the grille, routing it around the

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vehicle, increasing aerodynamics and fuel efficiency. Dorman now has 40 replacementsin this growing category, the need for which is expected to increase in coming years as more vehicles are released with this new technology to meet increasingly stringent fuel efficiency standards.

Other highlights this month include:

• An OE FIX windshield washer fluid cap (54262) for more than 14 million vehicles, featuring an enhanced tether design to help prevent the cap from eventually breaking off and getting lost.
• Aftermarket-exclusiveside mirror turn signals with LED lights for over 1 million Dodge Ram trucks (926-392/926-393).
• Aftermarket-exclusivethird brake lights for millions of Dodge and Toyota vehicles (923-130/923-138)

These are just a few of Dorman's featured new product releases this month. To sign up to receive all of Dorman's new product announcements directly every month, go to DormanProducts.com/signup. To learn more about Dorman, take the Dorman Virtual Tour at DormanProducts.com/tour.

Note: Vehicle-in-Operation (VIO) information in this press release is based on Dorman's analysis of third-party reports. OE FIX is a trademark of Dorman Products, Inc. or one of its affiliates.

Contact: Steve Gisondi, Vice President of Marketing

Email: [e-mail]

About Dorman Products

Dorman gives repair professionals and vehicle owners greater freedom to fix cars and trucks. For over 100 years, we have been driving new solutions for the automotive aftermarket, releasing tens of thousands of replacement products engineered to save time and money, and increase convenience and reliability.

Founded and headquartered in the United States, we are a pioneering global organization

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offering an always-evolving catalog of parts, covering both light duty and heavy duty vehicles, from chassis to body, from underhood to undercar, and from hardware to complex electronics. See our full offering and learn more at DormanProducts.com.

Forward-Looking Statements

This press release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements are based on current expectations that involve a number of known and unknown risks, uncertainties and other factors (many of which are outside of our control) which may cause actual events to be materially different from those expressed or implied by such forward-looking statements. For additional information concerning factors that could cause actual results to differ materially from the information contained in this press release, please see Dorman's prior press releases and filings with the U.S. Securities and Exchange Commission ("SEC"), including Dorman's most recent annual report on Form 10-K, its quarterly report on Form

10-Q filed with the SEC on July 26, 2021 and its subsequent SEC filings. Dorman is under no obligation to (and expressly disclaims any such obligation to) update any of the information in this press release if any forward-looking statement later turns out to be inaccurate whether as a result of new information, future events or otherwise.

Visit Dorman's website at www.dormanproducts.com. The Investor Relations section of the website contains a significant amount of information about Dorman, including financial and other information for investors. Dorman encourages investors to visit its website to view new and updated information.

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