Hey John,
Yep, that's the only place it mounts. Should be 2 holes on each side. Mounts to the shock bolt and the original bolt hole for the grab rail. So as to keep it from rotating up or down.
Definitely meant to be used with a lightweight alloy fender. And of course then mount the fender to the rear hoop, and also to the original mount point on the cross brace between the frame gusset. Just behind yer oil tank.
You might need a spacer or rubber washer to space it correctly. Had mine mounted up this way for more years than I can recall, so you should be all set.
Jeff