Remember I was dealing with Keisler's "perfect fit",,you'd be talking to Silver Sport. They bought Keisler but did they do more engineering for their "perfect fit"? Having gone thru it I still dont see how anyone can call it a "perfect fit". That pic you posted of the cross member in the tunnel,,I'd ask them "Is the a pic of an A Body, or a B,E,C,F. We A Boys have the smallest real estate to work with I think. Can't see a non A833 based box fitting in there easily and your looking at the TKO which in my eyes is bigger on to top side.