I need a factory correct pedal return spring for my Holley 1920 (R4656A). It is depicted in my 1971 Mopar Parts Catalogue 14-06-1. There are several springs listed, they all differ in the number of coils (16, 33, 34, 38) and color (blue, green, yellow, red). I can't be certain which part number is correct for my 225 6cyl engine. It looks like my choices are 2951471, 3462750, 3462751, 2946637??????????? Does anyone have any knowledge of the correct spring part number for my application? If you have a picture and/or knowledge of where I can buy this spring that would be enormously helpful. Thank you very much for your time.