Don't take my word for it, but I think these might work...
[link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFUC2&P=0[/link]
I know that they are not Integy brand springs, but they have the same dimensions.
These are the direct replacement springs for your shocks...
[link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXKVZ3&P=0[/link]
Or you could just buy some stock T-MAXX springs to put on them. See what everybody else thinks of these options, it's the best I could think of

. I hope you get it resolved cuz those are some nice shocks.