This is the outfit I got my driveshaft from, eventually. The price was good and the service was excellent.
If you are going cable-change on your Syncro this is probably one of the toughest items to obtain as it MUST come from a Rallye Golf, or G60 Syncro.
The reason for this is that the width between the output flanges on the cable change gearbox vs the rod change is +10mm on the cable change gearbox. The Golf models listed above are the only vehicles produced that used the gearbox and driveshaft length combination.
The Syncro shaft is 10mm too long, which means you will get very peculiar handling traits when cornering, as the shaft presses into the output flange centre.