Need some help finding a good part number. In the process of changing to Blistein shocks and the found most of the part numbers for new mounting nuts and bolts in the CD m/m I have. But, the part number N811623-S307, a nut and retainer assy, used to attach bottom of front end shocks. The bolt was so tight/rusted that I had to break off the lock tab to remove the nut. Have tried several Ford part sites but no help in crossing the number. Anyone got a suggestion? Thanks.