Thanks Pallidin, The list confirms that my altered was built by S&W which I already knew.Now I can prove to a friend that his altered was also built by S&W .I know that my car was built in 1973 with an Opel GT body with a 96" WB. I still have the body but have moth balled that for a T bucket ,makes it a one man operation at the track.Is there any way to find out what the tubing specs were for those early years ?I know mine will not cert because fo a couple of diagonals and uprights .