FD3S->FC3S Manifold?
 

Alright.. so.. it is MUCH easier to come by FD3S T04 divided manifolds than it is FC3S ones.

My question (excuse me if I just overlooked searching) is whether or not there is a spacer or something I could have fabbed to make an FD3S manifold fit on an S5 engine?

Depends on which unit you're talking about; some need an on-center turbine housing to work; oncenter turbine housing = lag monster...

You can do it a few different ways.Add a couple of spacers and longer studs.Cut off the turbo flange and reweld it at more of an angle.Someone also mentioned cuting a small wedge out of the main tubes just off from the engine flange and bending the tube down and then rewelding.