CV Joint Boot Guards (c/o Phill Lander's Site) ..They protect the front CV boots from getting torn by rocks kicked up by the tires.  This does happen, with the result that the joint then has to be removed so a new boot can be fitted, a nasty job.  These are not easy to get in the USA, but are available through VW dealers in Australia and Europe.  Here is a photo of an installed guard.  Phill Lander provides the following part numbers on his web Site, along with installation instructions.  See also Derek Drew's article on CV boot protectors and belt guards.

Right CV Boot Guard:.251 407 406
Left CV Boot Guard:...251 407 405.

Water Pump/Altenator Belt Guards  VW also makes deflectors to protect the belt for the alternator and water pump.  These prevent gravel kicked up by the wheels from getting into the pulleys  with the resulting destruction of the belt, something that does happen.  This can lead to the frying of your engine if you do not catch it soon enough.  We're talking tens-of-seconds here!  There are two separate guards/deflectors, both of which protect the vital waterpump/alternator belt.  Photos of of installed Guards are here (power steering) and here (water pump/alternator).  See also Derek Drew's article on CV boot protectors and belt guards.  The part numbers, again thanks to Phill Lander, are as follows:

Water Pump Belt Stone Deflector:  ..025 199 913
Alternator Pulley Stone Deflector:   .025 199 915

.On the fiche, it's Illustration 131-15 part 18 and (18)
.

Modifications for Difficult Journeys   This VW manual provides lists, drawings and discussion of modifications for journeys on difficult terrain, including fashioning skid plates, water crossing mods, and check lists.  The manual is not written specifically for the syncro, but is still a good resource.  Thanks to Jim for hosting the manual on his Unofficial Wetwesties site.