There were more 1600s produced as a full drop-top (vollcabriolet) - only about 200 real 2002 came this way (built in early 1971). It's not uncommon to find the 1600s with a 2-liter engine by now!
More common was the 2002 targa, converted by Baur, and built 71-75. These, too, were few in number (~2300 total), and had the removable roof panel and soft fold-down rear window.
All of these were for built for the Euro market, not offered here.
A great place to look is in the cars for sale section at
www.bmw2002faq.com