Part number for the upper bushing is 10000068. You know I am wondering if the only difference is the hardness of the rubber. I once used a set of G-body bushings on a 70 GS455 I had and they fit perfectly even though there was a different part number for them. I also used a set of lowers on my Cosworth Vega and they also fit like a glove. I guess the only way to find out is actually try it. But as far as part numbers go they do show a difference.