I think that I have the same Delta saddle box as Joel, but mine must be for a mini truck because I sit it on the bed floor and its below the rails. Got it at Tractor Supply. I didn't want a saddle box that blocked the rear window. Its light enough that I remove it when I need a full bed. I have it bolted to a bar that I ran across the bed from the tie down hook points. I also use that bar for bicycle tie down connection points.

1995 T100 SR5 XCab 2WD Auto