1. Autolite by First Brands Group LLC
2. Beru by DRiV Incorporated
3. BorgWarner Inc.
4. Delphi Group
5. DENSO Corporation
6. DieselRx
7. E3 Spark Plugs
8. Ford Motor Company
9. HKT Corporation
10. Marelli Europe S.p.A.
11. Mitsubishi Electric Corporation
12. NGK Spark Plug Co. Ltd.
13. Robert Bosch GmbH
14. Valeo Service SAS
15. ZENITH INDUSTRIES