It is not that simple, friend. At one point they were made by OME, but to thier specs. Then they had them made by someone else to thier specs. Both sets were progressive front and rear, and soft. Then they stopped having them made and used regular OME part numbers until thier demise. If you are looking for the first two options, the part numbers on the springs were 200 front and 250 rear. This means literally nothing for you now. If you want the OME numbers they used, it was just the same you'll find at EE or anywhere else. At that point, they sold the entire OME spring line. So if you called and said you wanted a "stage II" lift, you would be asked questions and get the springs you needed based on ride style, weight, etc... It would be a 2in lift. If you asked for "stage III" it would be the same, but with spacers to give a 3in lift. In conclusion...if you want the spring numbers for the OME lift that SG called Stage II after they stopped making thier own springs, they don't exist.
Get it?
Chad