HELP with #'s on injectors ...from newbie

[Fast4Ward]

I believe these are 50# injectors ( 17104487 ) but what is the # 4170? infront of 17104487.
the injectors have a greyish jacket.
what # are the so called 009's??

 

[Lee_Burough]

I searched for that number and it seems they are 50's....Do not know the significance of the other numbers.