Which motor, SB or BB? I bought grade 8 studs from them after calling thier tech people to get the part number for both lengths for the BB Mopar motors using the stock early water pump housings, I did add 3/4 inch to the under head bolt length for the 1/4 inch motor plate and nuts and washers I ended up ordering them from Summit(cheaper than buying them direct from ARP) and had them drop ship them to my shop from ARP