Yes, if installed correctly the numbers are visible where the torsion bar is visible at the crossmember. You may have to take some mineral spirits, or varsol, to clean the end off.
Yes, the part number is on the end of the part... However all of the torsion bars are the same color and the part number can look the same as another if you just glance at it quickly... Or the operator gets fatigue and sometimes their eyes can play tricks on them and they see the number wrong... When you do the same job over and over and over and over and over and over and over and over and over - you can make a mistake...
By putting a color mark on the parts, it's much easier and quicker for the operator to know what parts they are picking up...
Operators don't have any spare time between jobs.... If they did, the industrial engineers will add more parts for them to install, that's called "line balancing" to use each operator's time efficiently...
The assembly line does not stop, it keeps moving... It keeps the operators moving and sometimes they can make mistakes... Nobody is perfect.... Color coding helps the operator know what part to install and helps keep them from taking more time to read the part number.... It takes more time to look for a part number that blends into the part, than it does to look for a color mark on the part... They don't have time to double check the part number after they install it.... Not to mention that there was most likely not enough light on the assembly line for the operator to check the part number on the part after it was installed...
