Contec's I/O board list, unhelpfully broken down by computer interface:
http://www.contec.com/products/daq/analogio.php
Contec's equally giant distributor in the Americas:
http://www.dtx.com/
On this page, click on Global Products catalog, and either plug in the number of an analog I/O card (e.g. "AO-1604LI" or just go directly to page 7 for the chart that lists all their I/O cards by input and output buses and other features.
http://www.dtx.com/products/contec
Going to need one of these I/O blocks:
http://www2.contec.co.jp/prod_data/epd50a/epd50a_e.pdf