** Brokerage firm Barclays says President-elect Donald Trump's proposed 25% tariff on Canadian and Mexican auto imports, if implemented, could eliminate all profits for the Detroit Three - General Motors GM.N, Ford F.N and Stellantis STLAM.MI

** Automakers typically operate on relatively lean profit margins and a 25% tariff on vehicles and parts coming from Mexico and Canada would represent a significant cost to absorb - Barclays

** Brokerage identifies Aptiv Plc APTV.N, American Axle & Manufacturing AXL.N and Autoliv ALV.N as the most exposed suppliers and likely to be most affected by the proposed tariffs

** Barclays, however, says it does not expect the final tariff rates at 25%

** Brokerage believes GM at most risk from the move, as about 30% of its North American production is based in Mexico

** Following GM, Stellantis has about 29% and Ford has about 16% of its production based in Mexico - brokerage

** Shares of GM up 2.1% and Ford's up 0.6% in the morning trade, while U.S.-listed shares of Stellantis up 1.5%

(Reporting by Rupali Chaudhary in Bengaluru)

((Rupali.Chaudhary@thomsonreuters.com))