This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.
A: A1 & A2:
Mechanical linkages
Corrado & Passat (4 & 6 cyl):
Cable linkages (The SLC/VR6 uses a SIMILAR mechanism as the G60,
contrary to some "knowledgeable" car mags. The main difference is a
counter weight on the SLC, and a different mounting bracket)
A3:
Mechanical linkages with counter weight, Cable linkages on VR6s
 
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