First post here and pretty new to jeeps. Had mine for about 6 months now. 09 jku with 80k miles. Just got some rubi shocks for $80 on eBay and it included the springs as well. I looked at the tags on my current springs and they are the same as the ones im getting but I noticed something funny and haven't been able to find any info anywhere online about it so I figured I would ask. My rear springs are 58 but my front driver side is 17 and passenger is 18. Why is this? If it had to do with the gas tank or something shouldn't the front and rear on that side be a number higher?