RAy Sala isnÔÇÖt scrapping an SR. Probably has everything you need. Should be able to find him on FB if he doesnÔÇÖt respond on here. Given that the locker diaphragm is obsolete combined with the shipping cost, you might consider an ARB. Install it in your gen 1 3rd member and youÔÇÖre done. If youÔÇÖre looking for gen 2 rear disc brakes you can use the LS rear end with your 3rd member. Both are 10 bolt. I did exactly this.

90 LWB - Not your average bear

"You are what you are, and you ain't what you ain't." - John Prine