I think its '95 and up that have this extra side impact C-channel welded to the floor. The front legs of the seat bracket bolt to the front side of this. Earlier XJs have no side impact beam; the seat bracket sits flat on the floor on all 4 corners.
Sorry,been off the net. Ok so I gotta find a pick n pull or a parts vehical for the mounts. I have searched the web and no dice. Thank you for the help...now on to searching.