does anyone know where i can get a set of factory leaf springs for my 89 3/4 ton. i'm having to replace the front coil springs since the driver side is sagging and i was just going to replace the front coils and rear leafs and shocks all the way around while i was at it so i have no concerns of the back of the truck sagging or being lower than the front.

 

We have a great spring shop up in Flagstaff, American Spring. They'd re-arch your stock leaf springs and source the coils.
I'd say you should look around for a good spring shop nearby. H.