69 GMC C25 cross member swap to 85 GMC power steering questions

[MYOUNG]

I just bought a complete front end (Loaded cross member) off of an 85 GMC 2500 to swap onto my 69 GMC C25. My question has to do with my current power steering pitman arm and idler arms. I have a brand new 69 power steering box already installed in my truck. Can I simply bolt on the 85 pitman arm to the 69 box and use it with the 85 cross member??. The same question goes for the 85 idler arm. If I absolutely have to I can just swap over the spindles and rotors but I was hoping I could use everything. I also have a power steering box for the 85 as well but it is original and leaking etc so i wanted to continue to use my new 69 box. Thanks