I'm hoping someone can assist me in deciphering the markings on a set of Eibach Pro-Kit springs I'm looking to purchase from a guy. The part number on the box is 3831-140, which fits '93-'97 F-body v-8. The springs in the box are marked as follows:

Fronts: 3831.001, 22/99
Rears: 3831-002, 24/99

I just want to ensure that the springs in the box are the correct ones for the part number on the box. Also, what does 22/99 and 24/99 mean?