Ruff Stuff continued development of the Hell Fire knuckle that was originated and made by a small vender so, yes, there are some of the originally designed knuckles out there in service now. @jcardona1 has been running them.
For $975 plus other miselaneous fees you to can have a set on your 80. I just rebuilt mine and don't mind doing torque checks on my knuckle nuts so I will stay stock for now. This is one of those items that I would go to when I start having problems with what I have.
FJ80 Knuckle Kit Hellfire Fabworks
I got to see a large batch of these in person at the RuffStuff facility. They are definitely impressive and the top arm design seems like a big improvement over the original Hellfires.