Rut, let me take a look in the service manual and see if it has any cross references, sometimes they do. Also, you could take a look in your user manual, they sometimes list them there as well.
According to the NGK website, the 750 Brute Force uses a 7385, wonder if it would be the same for the Teryx?
http://www.ngksparkplugs.com/part_fi...id=203&type=ir
NGK Iridium IX® Spark Plugs