I don't know if this post will be useful or not. A while back when I was looking for a Spider manual, I came across a place called Highwood Alfa (http://www.highwoodalfa.com). It seems that some people on the forum are familiar with the place. Highwood advertises CD-based manuals for a number of models including the 164.
I have no idea what the quality of Highwood's product is like. I didn't want to take the chance of laying out a fairly large chunk of cash (taking into account the exchange rates) and then paying to ship it internationally. Besides, I was really looking for a paper-based product.
Maybe some other members can give you a recommendation on the Highwood product.