Is there any way I can find out what angle my front axle should be at?

I'm doing a buggy build, using Jimny front axle and three link suspension. My problem is that I don't know what angle to set the axle at so that the caster and prop are correctly set to factory specs. I've found a spec that says the castor should be 1deg55 (just under two degrees) but castor is very difficult to measure. Don't suppose anyone knows what angle the diff flange should be at ?

I've gone and measured the angle off the king pins, and set it to 2 degrees along the castor. Hopefully that's accurate.