hey man
you will need sprinter brakes or similar, perhaps look into ra40/xt130 brakes? not sure if they bolt on, but its worth finding out as they can be obtained cheap.
and also with the steering arms the reason the ke30 ones don't line up is because you have gone for biggr diameter strut, so yep use the 86 steering arms.
use the ke30 control arms tho, because as far as i know 86 ones are shorter and wil give you positive camber. just changeing the steering arm onto the ke30 control arm wil allow you to use the struts, you can keep your original control arms
and the question about useing xt130 steering arms, yes they will work, as will ra40 ones, howver you will have less steering lock than if you use ae86 steering arms, and if you want even more steering lock then hunt down some ae86 power steering arms.