Re: 14bolt SF 8 -6lug conversion
Awfully new, but I think SF's from around '88-up can donate the axles you need. If search was looking, I'd be able to go back and look it up, I know the years were covered before. I don't believe spline count changed betwen '88 and 2000, at least.
Is that a disk brake rear end? Again from my poor memory, depending on the drum size (if so equipped) the axleshafts are longer or shorter, but not the housing.