Yes I believe that is correct. It has been awhile since I did all my research. I went and got the build sheet for my truck to see what code the springs were. Along with my factory springs those were also an option. 988 is the last 3 digits of the mopar part number. There are about 15 spring options for these trucks and the parts guys only know vin and part numbers. I did alot research on this site and other forums.