1978 GMC CrossMember in 1960 Chevrolet Apache

[60short]

Hey Guys,

Long question into several short questions ...

I found an (almost complete truck) 1978 GMC C15 front cross member to swap into my 1960 Apache, but i just realized that it's got a 5 lug set up -

1. can I just put 6 lug rotors on from a slightly earlier truck, to get the front rolling?

2. if not, do any of the after market brake kits have rotors that would work for this?

3. does anybody know if I can use a 1978 rear end in my truck?(with the knowledge that I would need to chop off all the mounts and re-fabricate) If I remember right, this might be wider then the stock rear end by 3/4 in on each side? (I'm not running huge tires, so this might be ok?)

I am not opposed to switching to 5 lug all the way around, but I may need to split it into a few stages, as it needs to stay somewhat drive-able and somewhat affordable