My Eibach Pro Kit just got here. The outside of the box says 3510.140 (That's correct) but the springs inside have a different number on them... 3510.302 (2) and 3510.301 (2)
My Pro-kit had different numbers on the springs than what the kit number was. My kit was for the vert. I don't remember the actual numbers on the springs but I called Eibach to make sure before I installed them, especially since I got them slightly used.
If you need me to I can check the rears if the numbers are visible from underneath the car.
Update: found my instructions I used to install and had these numbers on them for the springs: (f) 3555.001 0402 and (r) 3514.402 96204
Don't recall what the "0402" and "96204" were though or why I had it written down.