I have a non turbo hub at the rear. I have an early thin disc on this rear. It runs a 23mm spacer.(but you can run it with out obviously)
I also have a late 87 944T rear set up which has the wider hub/disc (no spacer)-its kina built in to the later models!
I want to use the thicker /late model turbo disc on the early rear hub...( or is there an equivalent/thicker disc from a later model that would go on the early hub?)