I found on old receipt in my box of spare king bolts for my '51, 1-ton pickup, chassis designation JSF. Here's the NAPA part number dated 4/17/03: 262-1161.020. I ordered two sets because my local store had to special order them from NAPA. I know this is old but it might be a start. The standard part number would end with 1161. The .020 is because they are .020 oversize. That may be why they had to be made to order. Two sets came in one box and the invoice is for $105.80 list, $80.90 net and $10 freight. It's not clear who NAPA got them from. Perhaps Precision Engineering. Their name appears on the box along with the part number.
