1970 K10 front disc brakes

[4x4swb1970]

I want to switch my front axles from drum brakes to disc's on my 70 K10. I have a parts 71 suburban 4x4 with front disc brakes. I know there are differences in the length of the axles, i was wondering if there was any way to swap the knuckles or if anyone has been able to put 71-2 disc brakes on a 70 before without swapping both axles. If I have to swap the axles I will but id rather keep my nice clean axles underneath the truck if at all possible! Thanks!