Where to get an 6" or bigger liftkit for an F350

[frantzen]

Starting to look for an lift kit for my 97 F350, but i only seems to find 4" as the biggest, anyone who knows som internetshop that sells bigger??
And i also wonder if anyone can tell me if my truck is alreay lifted or if its standard? seems to sit higher than most standard 350 4x4´s ive seen in here.
on 265/75x16

[CT Performance, Inc.]

Some one could have changed front springs or added a leaf?
Only 1 way to lift a OBS and have a good ride quality..RS kit with SD springs frt and rear. You can go as high as you would want.

[1950gmcelc]

my truck is on stock 350 springs and i am running 315x70r17s