Use RockAuto.com's "Part Number Search" tab to identify that black box on the firewall or some other mystery part. Even a partial original equipment or aftermarket part number is often enough. Just use "*" for any missing or illegible characters. For example, a search for *339298* will find any part numbers that contain 339298.
Look for the Part Number Search tab at the top of the RockAuto.com catalog or use this You are not allowed to view links.
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