Tom's http://www.tti-us.com/sim/index.htm - Bought all my sim stuff from him
or do it yourself if you have the skills

http://www.heliguy.com/nexus/fmsinterface.html
http://n.ethz.ch/student/mmoeller/fms/links_e.html

there are more I am sure, do a web search or ask in the sim forum.