Jeep TJ rear springs for 64

[truckeroy]

I just read somewhere that rear springs from a Jeep TJ? will fit on my 64 sb pu. My understanding is that it will lower the rear height also. Does anyone know about this set up? Will they fit? And what will be the static height? The statement said to use the front std '64 shocks on the rear for the lower height? I have seen pictures of these springs and they appear to be of the same style and are cheaper than those listed for our trucks. Any comments? Thanks, Roy