Hello to all who read this...

Hey folks a friend of mine is working on his 1990 german import caravelle came with 1.6td 5 speed now has 1.9td 
He is Working on rebuilding his transmission with a taller 5th gear for lower highway rpm. Now we are in need of some parts it has a ASS05 trans,here is the parts list that we need to fill out...

5th gear taller then stocks .82 (lowest possible ratio)
Reverse gear 
All syncros
All bearings
All seals

Would anyone know where we would be able to get all these items that he needs? Any information would be greatly appreciated!

Thanks for your time! 

Marco