Anybody know where I can find one? I need to use a S5 NA intake manifold on a T2 engine.

An adaptor plate looks like this:

 

Actually, it will bolt on.

The ports won't match, but you probably knew that already. Some grinder work and a lot of JB Weld can fix that, if you're patient. Will work loads better than splitting the port and then re-joining it, as well.

PS - That plate is for converting an old style 4 port to Turbo II style, and what holds down the primary fuel rail? Also OMG MIND-TRAIN