spring mounting widths K20 and K30

[crosby]

I just read somewhere that there is a significant difference in mounting widths for 3/4 and 1 ton trucks. I want to put my Dana 60 and 14 bolt FF from my rotted 1 ton on my solid 3/4 ton. Apparently, there is a difference of 4 to 6 inches or so. Anybody familiar with that? I really should get outside and measure it, but its too f@cking cold out. I am planning on stripping the one ton next weekend if I can finish stripping my Jimmy this weekend. Brrrr... I did hear from a reliable source that I need to use 1 ton brake hoses on the front axle in the K20.