I've seen the single wiper conversion done on a superbeetle from Germany.
The feature article said that the guy used a stock beetle wiper motor and arm, the linkage was from a Scirocco and the blade is a rear blade from a MkII Golf.
There are videos of this car on the Volksworld webpage, it's a silver GL with gold painted three piece BBS wheels.
The article is in the April 1997 Volksworld magazine.
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