Call again but this time talk with an engineer. I forgot the names but maybe Jerry was one of them. Anyway you may need the nuts part number ARN12-1, these are the 12 point nuts and the washers part number is ARW78N. The stud part number is exactly whats printed on my invoice. They are $8.45 each. Use my invoice number of 0487114-IN. My customer ID is ARPCS. My sales person was 9999 if that helps....I see my order number on the invoice is 0489269 on 01-25-08. It can't get any easier than this for the order desk. These studs are 7 inches long with a 1/2x13 national course thread on the bottom and 1/2x20 national fine thread on the top. P.S... Go to the ARP web site and read carefully under "friction".... Some here have stated that there is no information posted about torqueing the studs up and down 5 times to reduce the tightening friction. Its printed in bold black right there and it really does make a differance in the torque value when your done.