Bwahahaha

I have no idea where you can get hilux diffs to suit a coiler. I know where you can find hilux diffs to suit a hilux

Seriously, if you want to run hilux diffs you are up for a mass of fabrication. At the same time you should/must get rid of the retarded coil suspension design.
I think by asking the questions you are, you aren't ready for this task.
Steve.