Anyone installed Air Lift bags (part # 57212) on a 2008 F250 Crew 4x4? I just received them today and looked at the install procedure. First of all the manual says you need minimum of 6 1/2" to 8" between upper and lower brackets.After setting lower bracket and clamping upper bracket in place using their template for ref. hole, I see I only had 5 1/2- 5 3/4". Called Air Lift tech support line and they said anything over 5" is OK.Next I looked at the new mounts for the stock jounce bumpers,lowering them 2 1/2''. That only gives 1 1/4'' of suspension travel before jounce bumpers hit bottom and won't even get contact overloads to touch the perches. Can someone who has these let me know if all this is ok before I actually do the install or should I look at the Firestone bags and send these back. They are the correct kit listed for this truck but don't look like it. Any advise would be great. Thanks.