meaning of numbers on supply tubes?

[Jim Ross]

I just had a new set of injectors and a new set of supply tubes installed. Upon looking at the supply tubes that came out of my truck, I see they have different numbers on the tapered part of their bodies. What is the significance, if any, of these numbers?

Ex. : F1572-0632

" 37

" 43

" 44

" 54

" 55

Below these numbers they are all marked the same:

06-07-18

FPT.

 

[Shadrach]

They are more than likely a suppliers ID # The last one is of course is the date of manufacture. Since all 6 connector tubes are the same I'm not sure why the #'s would be different? Shad

 

[Jim Ross]

I figured the date part out, but the others remain a mystery.