I have one of my own design and construction. They're helpful on cars with IRS or coil overs in back but that's about it. When I had my IRS in the car I had coil overs too and that was a lot of load on the shock towers so I braced it and it helped but not much. With the solid axle and coil overs it's just a place to strap by bazooka sub-woofer to.
The KB design never impressed me too much. To be useful it needs to be robust and welded into position not just at the towers but also in the midd of the span. If you're going to do it, just geta section of 1" .120 wall DOM steel and weld a .080 thick plate on either side to mount it to the shock towers, then weld that in. before you get welding on the ends, you should get a piece or two of .120 thick angle iron in 2x2, cut a channel in the tube steel to accept the base of the V in the angle iron and weld that in as a sort of mid-span load distribution point. Weld that to the floor of the trunk with a nice heavy .080 mounting plate under it to spread the load across more of the trunk floor. If you'd like I can make a drawing of the design. Then you can have your buddy that has a mig welder fab it up for you and it'll be better than the KB bolt-on by a long way. The only retail one I've seen that's worth a damn is the one made by Hans Racecraft. It lacks the mid-span support but is otherwise top shelf. Mention that r3dn3ck from Wildhorses sent you and he might just hook you up on the price.
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