Fuel distributor double trouble

[nrapp]

Hello,
I have two questions concerning the rubber hose coming out of the fuel distributor of a EURO 280SL 1985, with M110 motor. The hose was in bad conditions, so i took it off, but now I'm having trouble finding a hose same size, anyone know which one i should choose? The hose is made of harder plastic inside, and soft rubber outside. Reference i can read but not find anywhere:COHNEN MULTILINE 360 0300 on the outside part, and the inside hose carry reference 313 0305. Not sure what mm size it is.
The second question is in the manipulation, the electrical connections got unplugged, and i can plug it back both ways. Not sure of the polarity. Please see the picture, and let me know if the size i chose are correct.
The picture also shows the location of the hose i am looking for. For now, i'm just using a shorter portion of the inside part.

Thanks!