Tony,
I'm sure I could fabricate the stuff for a newer 14 bolt but, this is now my daily driver so the less work the better. Looking in the LMC catalog under "How To Identify Your Differential" they show a 10 bolt and 12 bolt, Dana 44 and Dana 60? I think. Doesn't show my rear of course. So, I'm thinking (hoping) that some 60-66 GM 3/4's came with these which should just be a bolt-in and $200 + misc. for freeway gears. That's where I'm leaning right now. Can I find one? That may be the tricky part.
