New question about Disc brake spindle cross

[red211]

I am swapping in an 87 cross member assembly to my 63 for disc brakes and ps. Now I find I have 1” rotors so I can’t use six lug rotors to keep my wheels which I like. I have found three donor vehicles with 1 1/4 rotors, but they are on 1996 2500 five lug vans. Control arms, calipers, rotors and the way the sway bar hooks to control arms looks exactly like the square body. They have one 86 van that looks the same but rotors are gone so I can’t verify if it had 1 1/4. Will van spindles be the same? Sure looks like it but don’t want to take them off and pay to find out they are wrong. What do the experts think?