M6866 fits '70-72 Dodge Challenger w/ 340 motor and is NOT intended to be used in your 300C. Wayne Texas Date: Fri, 8 Aug 2003 11:36:23 +0200 From: Oddvin Skråmestø <ragtopman@xxxx> Subject: . Hi. Does Carter M6866 fuelpump replace the original? The arm seems a little bit longer, but it looks very similar. My partsshop tells me it will fit, but I will ask you first. I have just arrived back from a 2000 miles trouble free trip to Sweden, with my 300C running on an electric fuelpump only. What a great car for long distance driving! Thanks Oddvin Skråmestø Norway