S&W offers a 6/8 pt for $149.00. I would think that would be hard to beat in terms of raw materials and your time just to cut/notch/bend/fit your own. Its what I've got in my car. If you watch their site religiously, you'll see they run a $99 deal about twice a year.
You can see my S&W kit at our site under the Tech Articles area.
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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team