If you have the complete early NA 944 hub, it will simply bolt straight onto the 1303 two bolt strut - it is exactly the same tang size and bolt spacing. Then there's no mucking around with bearing sizes, spacers and caliper brackets. It's all factory Porsche and no problems with having it engineered.
You will however need the 17mm lower ball joint from Kerscher in Germany who make it specifcally for this application.
http://www.kerscher-tuning.de/kaefer/index.php?gruppe1=Bremsanlagen&gruppe2=Zubehör Umrüstung Porsche-Bremse
Sorry website would not copy correctly - just reclick vw special then brakes
You will also need slightly longer tie rods from Veedub Engineering in Canada (he knows the length you need). He was actually much cheaper than trying to get custom tie rods made locally in Brisbane from a VW specialist.
http://vdubengineering.com/brake-parts-kits/