newbie queastion, please help

[AK72]

hello everybody,
i am from Belgium, Europe. i just sld my 71 Buick Riviera Boattail to get a new project. i waswondering if yoy guys can tell me if the parts, mostly chassis, of 60-66 suburban and a panel are the same? and how about the parts of C10 long bed and a PAnel, subbie?
been looking on the intrnet and found much more parts for a
c10 pick up then for a Subiie,Panel. wan't to modifie the Panel with 4link, spindels or strong arms, slammed it.
if parts are not the same can you guys help me with some sites who sell SUbbie, Panel parts?
greetz willem