I'm trying to figure out what springs are on my truck to see if there is a stiffer OE option. I have the CCD suspension, no max tow package. Attached are photos of the tags of front and rear springs, but I cannot find these part numbers anywhere. parts.ford.com references 5560 as appropriate rear spring. What is the correct part number, and are there stiffer options (from HD tow package)?
VIN: 1FMJK2AT7JEA29353
Rear Right JL14-5534-CC
Rear Left JL14-5534-CC
Front Left JL14-5310-DD
VIN: 1FMJK2AT7JEA29353
Rear Right JL14-5534-CC
Rear Left JL14-5534-CC
Front Left JL14-5310-DD