Primer line mystery

[skymark]

I recently purchased a 1974 180 and when doing a visual inspection I found a rubber fuel line that connects to the "T" that then routes the three copper 1/8 inch primer lines to the cylinder heads. the parts breakdown doesn't give a clear listing but I was able to get a "AN" part number off a metal tag attached to it (AN 6270-2D0074"). Problem is I can't get a hit on it through normal part s channels except one that lists it for $151 for a 12" 1/8 inch line with AN fittings on each end. Has anyone run into this black hole or am I missing something on the parts illustration?

 

[sierrakilo99]

 

[philiplane]

 

[Bluerooster]

 

[sierrakilo99]

 

[skymark]

 

[Glen]

 

[skymark]