Do you have a Bentley service manual, it is a must have for anyone servicing a VW.
When asking for questions in the Mk2 forum, you will get people like myself inquiring if you own the manual. The reason we do this is to save you time, since the manual will answer many questions you have and future questions. All you have to do is read it, my manual is tattered from reading it over the years. Link to my pic. http://www.3dzubehor.com/webpics/olddirtybastard.JPG
When you replace the wp, you don't have to replace the wp housing which requires the remove of the alternator and ac compressor.
Where is the bolt located?
My advice when replacing the wp, replace all the bolts on the wp too. Make sure they are stainless steel or add anti-seize to non SS bolts.
Also do not use the paper gasket, use the metal/rubber gasket as used on the Mk3 ABA engines.
On shouldered bolts, you can use an 11mm 12pt socket, hammer it onto the head of the bolt, and use a wrench to remove the stripped bolt. Non shouldered bolts I think you use a 13mm 12pt socket. You can then put the bolt in a bench vise or use visegrips to work the socket off. Additionally you could hammer a male torx socket and try to remove it that way. For stubborn one, an air chisel can help.