Upper shoulder mount. I drilled and tapped a 1" square tube to go behind the two cab support members. The mounting bolt goes through a hole in the tube where a thick threaded plate is held in place by a screw
Bottom mount where the retractor is mounted. I used the large washer that came in the companies mount kit to increase the load over a larger area. Underneath is where a chunk of angle iron is for support.
Lap belt section is mounted to the two body mounting bolts. As I recall, I replaced the bolts with longer grade 8 bolts. These bolts go all the way through a frame cross member under the cab. Existing mounting point is nice!
Here is the angle iron under the retractor, under the floor pan. Yes, my truck is that rusty... But most of that is just under coating peeling off.
Here is where I http://wescoperformance.stores.yahoo.net/index.html