Timing belt is Audi 2.2 as is the water pump.
The sump and seals should also be the same but not 100% as i never had to change them on the 2 i owned.
As for the manifold i'm thinking that is Audi as well but the downpipe is SA specific.
You could always have a 5 into one stainless manifold made up if you get really stuck.
The best person to ask for definate part numbers would be someone with access to VW SA's ETKA or ETOS system.
Or send Stuart Stirling at the Syncro Hospital an email asking him if he'll supply you with all the part numbers you need.
Don't worry he's very helpful and i'm sure if you ask nicely he'll be able to help you out.