WASHINGTON, Sept 6 (Reuters) - A bipartisan group of

lawmakers asked the CEOs of six major auto parts retailers if

they bought products from a Chinese company that may evaded U.S.

tariffs, according to letters seen by Reuters on Friday.

Representative John Moolenaar, a Republican chairs a House

panel on China and the committee's top Democrat Raja

Krishnamoorthi along with other lawmakers asked AutoZone ( AZO )

, O'Reilly Auto Parts, Genuine Parts ( GPC ),

Advance Auto Parts ( AAP ), First Brands Group, and Factory

Motor Parts to address concerns they are purchasing parts from

China's Qingdao Sunsong and its U.S. based subsidiary.

The lawmakers -- which also include Senators Sherrod Brown,

a Democrat and Republican Bill Cassidy -- raised concerns

Qingdao may be illegally transshipping Chinese products through

Thailand into the United States to evade U.S. customs duties.