rear axle sadle location help

[bbcmudtruck]

I need help figuring out exactly where to weld new saddles to my axle. Originally the axel was under a coil spring truck. Someone cut the coil saddles off and welded leaf spring mounts to it. Well, I've since switched back to a coil spring frame and need to locate my saddles. I'm pretty sure the axle isn't centered in the frame. The frame is bare at the moment with only the front suspension in place, so there isn't any weight on it. Does anyone have measurements handy?