944 early hub casrrier and later 944t disc
 

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?):)

I would suggest asking Lanner at www.vdubengineering.com , or ask him in his section on here. The later rears will not bolt-up to the early hubs without some mods. The e-brake shoes would be a problem, and to offset the rotor enough to line-up the e-brake shoes, you would put too much side load on the hub bearings. If your wanting to add track use the ali trailing arms.