The system in the US from 90-93 is somewhat inadequate and gimmicky being mounted on the door. From 94-96 the US system is the same as the Canadian setup for all years: mounted on the body. If you're upgrading to the 94-96 system, the classiest way to install them is to use the updated door and pillar panels. Primary benefits include a cleaner install as well as a single-belt design that allows one to sinch the belt tight and lock it in place.
Cheers, JBrobst
"A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing." George Bernard Shaw