I am installing a new fuel line on my 72 Chevy Truck

[GOPAPA]

In the picture I have shown below is a knob on the end of the fuel line,,,
( this is on the end of the old fuel line I took out of my 72 Chevy Truck which I assume came this way from the production line when building this truck) ,,,,

I have yet to find a way to make this knob on my new fuel line that I am bending and installing from my fuel pump to the rear tank.

This knob is a more secure way to make sure the hose to the fuel pump /fuel tank stays where you want it to stay in place .

Is this knob indigenous to General Motors or is it a common tubular procedure fabricated on many fuel lines for hose to tube hook ups elsewhere?

I talked to a guy some years back and he told me that he used the flange tools and created his own knob ,,if any one knows of the correct way I would like to know ,,or if you have made your own I would like to know ,,or if there is a place you know of that I can take my fuel line into and have it done I would like to know more about this also .

thanks for reading and any help on this would be appreciated .. papa Larry