I have a 2012 f250 with 8" procomp and I wanted airbags for towing. I searched endlessly with little luck. The recommended ones don't work because the jounce bumpers are not in the correct position. I ended up doing a firestone outboard set for earlier models and so far it seems great. I did no spacers on one side and the 1" spacer with an additional 3/8" spacer on the other side. Passenger side had the lower front bolt washer overlap the shock mount, but it tightened down great. Driver side had the upper front bolt washer overlap a bracket and didn't tighten great, but the other three bolts more than made up for it.

I used a 3" spacer and mounted the brackets at the minimum height (5" + 3" spacer). I wanted to get like an inch of lift out of it with no load. At 25# I got the inch of lift and the ride is identical to no bags. At 70# it is 2" of lift and is very rough. I have not hooked up and tested my trailers yet. I'm sure they will be great.

I'm posting this to hopefully help others that are in my same boat.

<a href="http://s276.photobucket.com/user/Z28Johnny/media/Mobile%20Uploads/20140825_131657_zpsda786b9b.jpg.html" target="_blank"><img src="http://i276.photobucket.com/albums/kk28/Z28Johnny/Mobile%20Uploads/20140825_131657_zpsda786b9b.jpg" border="0" alt=" photo 20140825_131657_zpsda786b9b.jpg"/></a>

 

It looks a little bit crooked in the picture, but all measurements are within an 1/8". It looks great. I used the airlift wireless system and it too is awesome. Sorry for the dirty pictures. It has been raining the last week or so. Usually its all clean and pretty.