it seems to me if the Super Duty Springs are a bolt in modification for the OBS trucks and the 08^ springs are a bolt in modification (with the PMF brackets) for the 99-07 trucks .....in theory it sounds like it would work.
The 2008 plus leaf spring center the axle in the middle of the spring, I think the 2008 plus are 8" longer in the front. If you look at your current leaf springs the axle is a lot closer to the front of the springs. The newer springs are suppose to give you a better ride and handle a load better.
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