As far as I can tell 99-07 rears were one length, 08-11 were slightly longer and the 11+ were longer than those. Trying to figure out if the rear spring codes changed with the spring changes. I'm trying to find a set of 08-11, or 11+, high gvw springs.

Figured you SD guys would be in the know. Most info I can find is on reference to the 99-07 springs, not much out there on the 08+ stuff. These are going into a custom project, not a SD. Thanks.