I think this is what you need on the outlet to the carb: Weatherhead (Eaton) 202X5. Straight Adapter - 1/8 in Male Pipe Rigid x 5/16 inch Female Inverted Flare.

Please Note: I have edited this post. The information above is incorrect. The Weatherhead (Eaton) 202X5 pictured below IS NOT correct for a Carter M6903. It is correct for a Carter M4845.

David

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Last edited by David1971; 04/07/20 02:05 PM. Reason: Incorrect information