My new 67' long bed 1/2 ton 6 lug

[Harley1650]

I just picked up a 67' long bed off Craigslist last night. I NEED to do the front disc brake swap. After searching, my brain is frazzled......The truck is lowered now and I will be getting Mcgaughy's spindles. What I am looking for in here is if theres a list of Chevy parts for rotors, calipers, rubber hoses.

I also don't understand yet about why crossmembers are swapped, but I will keep looking.

I guess my main question is, can I get rotors, calipers from a newer disc brake truck without changing ball joints, tie rod ends and such??