I've only just found out my 1994 has a 27.0 mm post I think as the 27.2 post I have a the other option other than the polished rock shox post is too big .
Your 27.0 post do you still have it and what would you want for it ?
Ive a 96 and that's 27.2mm shop i know well said go with the largest that fits as did have a 27.00mm orig which slid in quite easy it did lock with bolt also as they can crack round collars if under sized or where it goes through top tube.
Polish time ! Get some mothers polish from the bay , it was recommended by all my vw mates and its amaizing , you use the free micro fibre cloth and it really works. If the frames needs a slight bit of work before then try some 2000 wet and dry .
I may have the frame with me on Saturday when I go to work so ill have to let you know.
The 27.0 rock shox post drops in a treat and the 27.2 is a no go at all unless you force it in which I don't want to do as it needs to be moved up and down. As we have a wheelie challenge planned on cannock chase when a new bridge opens