G30 vs C20 front suspension and brakes

[rpmerf]

I am looking to do the disc brake conversion on my 70 C20. I am looking around the local junkyards (LKQ) and the only potential candidate I see for spindles is a 1987 G30.

I am wondering what parts swap. I was looking on rock auto and I see the G series vans use different idler arms, pitman arms, and outer tie rod ends than the trucks. I am not sure if this is because the spindles and center link are different, or if it is just because the geometry is a bit different.

Are spindles and center link the same between an 1987 G30 and an 83-87 C20/R20?

Thank you