Many years ago, I swapped in Mini-truck knuckles for the larger steering bolts birfs. I opted not to use the mini-truck rotor/hubs and reused the LC hubs rotors and calipers.
You might want to confirm that you have the early style LC knuckles with smaller trunion bolt pattern. The...
Looks like you might have picked up a 40 axel with a mini truck disc conversion. This was pretty popular back in the day. These have the same "large pattern" knuckles as the FJ60s. IIRC the mini truck rotors are a press fit.