Toby and group, I have been looking into the trailing arm bolts due to the request of several people and i'm glad to see someone with the knowledge and equiptment to test things out. In my research I have found that even though 18-8 stainless is good, I decided to use a 316 Stainless due to the added nickel and molybdenum to the metal for corrosion and strength. What do you think. The shifting arm pivot bolt I sell on the web is a 12.9, alloy steel vs the Delorean original at 8.8 .The trailing arm bolt if I'm correct is M12x19. John hervey http://www.specialtauto.com/