Waveski, both ends of the rubber flex in the pictures appear to be inverted flare, that is the same type of fitting for brake lines and most fuel connections at the carburetor and pump. I can't tell from the pics what size it is but I would guess at 1/4" or 5/16", the inverted flare would be bigger than those dimensions.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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