FF axles are a neat non-USA novelty item, but not worth the trouble people go through for them.
Trouble... my semi float axles were shot due to pitting on the bearing surface so I bought a complete 45 FF axle for $50. The seller called me before I could come back with a truck and tools to pick it up and offered to sell me the 45 for $100 I didn't waste any time... and had it towed home before he could change his mind. All in all it cost me $150 for the 45 less the trans and T-Case. I sold off at least 3 times as many $ worth of parts. Oh to be the early '90s again.
Biggest up side is there's are races for the bearings and they don't rely on the axle surface.
For anyone wondering why it was being parted out... the part of the frame that hadn't been replaced with channel evaporated. The tub was rotted out, hardtop rough, 2F needed a rebuild, fenders shot, and box was confetti. I sold everything salvageable and the rest was recycled... that didn't crumble when touched. However, I've seen worse repaired now.