We finished the original spec Mk 1 rear axle drive bolts today. These were made from original blueprints in heat treated 4130 chrome moly. They come in a full set of 12 for $395 and are stronger than originals. These are better material and solid in the center instead of being hollow all the way thru to save a few more grams in weight. We made these solid to almost double the shear strength. We did drill in from both ends to make them look lightened. I also have the matching lightweight aircraft lock nuts if needed. The bolts are part number GT40P-7-5270.