Sky Offroad and others sell a kit to mount the 63's if you don't want to make your own.

I just bought the rear hanger with the bushing for the Chevy 9/16" bolt. It mounts directly behind and touching the original hanger. I think? it's 4" back hole to hole. I fabbed my own shackles. I think Sky's kit uses 6" shackles.

I also fabbed my own front hangers. I think they mount 11" forward of the old mounts hole to hole. This information is out there in many places.

I'm building my RUF packs right now but, havent done my SAS yet. You'll also probably have to buy or fab mounting plates for your IFS box and move it as far forward as possible. All that info also out there on many sites.

Hope this helps.