Sorry I haven't had anything to do with EFS.
Often, the rear springs have a greater spring rate (lbs per inch, or kg/m or N/m) than the fronts to accommodate extra loads. Also the free length of rear springs are often greater than the fronts.
Usually there is a difference between the left and right hand springs as well. The free length of the right spring should be a little longer, or a little stiffer, to counter the lean that occurs over time.
For comparing spring rate:
- smaller wire diameter for reduced rate
- more coils (turns) for reduced rate
Without calculations it is difficult to compare rates if both the number of coils and the wire diameters are different - unless the spring with larger wire also has fewer coils. Though an experienced person may tell when viewing both springs side by side. The height may also give it away.
Hopefully someone will have the codes for you. If not post a pic of the springs side by side, showing clearly the difference in free height and number of coils. And measure the wire dia.


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