Does anyone know if the ProImpact Frame Sliders are any good. They are listed on parts411.com for the '03 6R. I'm thinking of getting them but don't know what their reputation is. The price is listed as $11,000+ (which can't be correct) so I called them up and they told me that they are on back order for $18.95. This seems pretty cheap. Has anyone heard anything or installed them yet?